Baked Rice, Potatoes and Mussels (Tiella)

Why this recipe works for endurance

Both endurance slots, from one dish. A fuel-up meal needs 80–120 g of carbohydrate per serving and this one carries 106 g — 60 g from 75 g of dry rice per person, 35 g from 200 g of potato, the rest from onion and tomato. A recovery meal needs carbohydrate plus 20–30 g of protein, and this one carries 25 g. The position stand of the Academy of Nutrition and Dietetics, Dietitians of Canada and the American College of Sports Medicine puts post-exercise carbohydrate at 1.0–1.2 g per kilogram of body weight per hour for the first four hours when recovery time is short, with 20–30 g of protein to start repair (Thomas, Erdman & Burke, 2016). For a 150 lb (68 kg) athlete, one serving of this is roughly an hour and a half of that carbohydrate target and the whole protein target in a single plate.

Rice is not a compromise on pasta, and for some stomachs it is better. White rice and dry pasta sit within a few grams of each other per 100 g — 80 g of carbohydrate against 75 — but rice is lower in fiber and has no gluten, which is why it is the staple carb-load for athletes who get gastrointestinal trouble on pasta. Up to a third of endurance athletes report GI symptoms during long events, and the practical response is to reduce fiber and fat in the 24 hours before the start (de Oliveira, Burini & Jeukendrup, 2014). This plate is 16 g of fat, mostly the 3 tablespoons of olive oil.

Where the 7.1 g of fiber comes from, and when to lower it. Almost all of it is potato: 800 g of potatoes for four people is 4.4 g of the 7.1, and the tomatoes and onion carry most of the rest. That is a good number for a Tuesday and a slightly high one for the night before a race if you know you are sensitive. The honest fix is not to change the recipe but to halve the tomatoes and serve a smaller plate with a slice of white bread, which keeps the carbohydrate and drops the fiber. The plate as written is better placed two nights out, or as the recovery meal, where fiber does not matter at all.

The sodium is the part most recipes get wrong in the other direction. 718 mg a serving: 291 mg of added salt, 286 mg from the mussels, 120 mg from the pecorino, and the remainder from the vegetables. Sweat sodium losses run from about 500 to 1,500 mg per liter and a hard marathon can cost several liters, so the post-race plate is one of the few times in nutrition writing when more salt is the right advice. Sodium also determines how much of what you drink you keep: in controlled rehydration trials, drinks and meals with meaningful sodium restored plasma volume where plain water did not (Shirreffs et al., 1996; Evans et al., 2017). Against the 2,300 mg daily ceiling in the Dietary Guidelines this is 31% of the day, which is a lot if you are sitting at a desk and the right amount if you ran 26 miles.

Mussels are cheap protein with a nutrient profile this site cannot fully print. 400 g of mussel meat costs about what a single salmon fillet does and brings 48 g of protein to the dish. Mussels are also one of the densest common food sources of vitamin B12 and iron, and they are a farmed shellfish with a very low environmental footprint — but our nutrition table has no columns for B12, iron or omega-3, so you will find no milligram figures for any of them here. The claim is the food, not a number we did not calculate. What we can print is in the table: 86 calories and 11.9 g of protein per 100 g of raw meat, at 2.2 g of fat.

Tips from our kitchen

• If opening them raw defeats you, there is an honest shortcut — and it costs you something. Put the scrubbed mussels in a wide pan over high heat with the lid on, no liquid, and pull them out one by one the second they crack open, about 60 to 90 seconds. Strain and keep every drop of the liquid. You lose a little plumpness, because they get two cooks instead of one, and the difference is noticeable side by side but perfectly acceptable. Fifteen minutes in the freezer before shucking also relaxes the muscle and makes the knife much easier.
• The thickness of the potato is the recipe. Everything else here is forgiving. If you slice at ⅛ inch, the potatoes and the rice finish within a couple of minutes of each other, which is the entire design of the dish. If you slice thick, you will be choosing between hard rice and burnt potato at the 50-minute mark, and no amount of extra water fixes it.
• Use a wide, shallow dish, not a deep one. The tiella is meant to be two or three inches deep in total. In a deep casserole the bottom steams while the top bakes and the rice cooks unevenly; in a wide dish everything is close to both the heat and the surface. Earthenware is traditional and holds heat longer, but a glass or ceramic 9x13 is what most people have and it works.
• Keep the shells in. They look rustic and they are also useful: they hold their mussel off the hot base and they tell everyone at the table exactly how the dish was built. If you are serving people who would rather not deal with them, take the meat out of the shells after cleaning and tuck it into the rice layer instead — the cooking does not change, but you lose a little of the liquor that stays trapped in the shell.
• No cheese on the fish? Not in Puglia. The rule that Italians never put cheese on seafood is a tourist rule, and the tiella is one of the dishes that disproves it: pecorino goes in, in quantity, and has done for as long as anyone has written it down. If you would rather leave it out, use 2 extra tablespoons of breadcrumbs for the surface instead and add ¼ teaspoon of salt — but the plate loses 3 g of protein a serving and a lot of savor.

Variations

• With clams instead of mussels: 657 calories and 26 g of protein. Same weight of shucked meat, same method; littlenecks or Manila clams, opened raw over a bowl exactly the same way. Clams are leaner than mussels — 74 calories per 100 g against 86 — and slightly higher in protein, so the plate comes out 12 calories lower and a gram of protein higher. What really changes is the salt: clams carry far less of their own, the plate drops to 488 mg of sodium a serving, and it wants an extra ¼ teaspoon added. If you want the clam version written out as its own dinner, our spaghetti alle vongole is the one to cook.
• Vegetarian, with zucchini and cannellini: 692 calories, 21 g of protein and 12 g of fiber. The summer tiella in Puglia often has zucchini in it anyway. Drop the mussels, add 1 lb (450 g) of zucchini sliced the same thickness as the potatoes in the middle layer, and a 15 oz can of cannellini beans (260 g drained) over the rice to replace the protein. Use 3 cups of vegetable broth instead of the mussel liquor, since there is no liquor to catch, and add ¼ teaspoon more salt. Two numbers move: fiber goes from 7.1 g to 12 g, and carbohydrate climbs to 122 g, just past the top of the fuel-up range. That makes it a fine Tuesday dinner and a poor night-before-the-race one.
• A smaller plate, for a normal day: cut it into 6 instead of 4. Same dish, 446 calories and 71 g of carbohydrate a serving with 17 g of protein, which is a sensible portion for anybody not running a marathon this week. The tiella is sized for athletes in the recipe above because that is the file it lives in; nothing stops you from treating it as a side dish to a plate of greens.
• With rice swapped for farro, as a training-day version. Pearled farro takes about the same hour and gives a chewier, nuttier result that holds its shape better on day two. We have not calculated the numbers for that version, so the table above does not apply to it — expect more fiber and a little more protein. It is not traditional and it is not for the night before a race, but it is very good in November with the last of the tomatoes.
• Without potatoes, which is heresy in Bari. Some families in Taranto build it with zucchini only and more rice. It is lighter, cooks in 45 minutes, and is a different dish — worth knowing about, not worth doing if you came here for the carbohydrate.

Storage & meal prep

A tiella is better on day two than most seafood has any right to be, because the mussels are protected by their shells and the rice keeps absorbing. Cool it quickly — uncovered on the counter for no more than an hour, then into the fridge — and it keeps 3 days covered. Reheat it covered with foil at 325 °F (165 °C) for 20 to 25 minutes, or eat it at room temperature like a tortino, which is what half of Bari does with the leftovers. A microwave works for a single square at 50% power but it will tighten the mussels. Do not freeze it: the potato slices go grainy and the rice turns to paste, and unlike a sauce there is nothing to hide behind. If you are deliberately cooking it to have a recovery plate ready after a long run the next morning, that is exactly the right plan — it is one of the few dishes in our Mediterranean meal prep guide territory that is designed to be eaten warm, cold or in between.