Marmitako

Method

Marmitako is a fisherman's stew built on the principle of layered cooking: the vegetables establish a flavour base while the potatoes thicken the broth through starch release, and the tuna arrives last to stay tender. This structure matters. Start with 100 ml olive oil in a large, heavy-bottomed pot over medium heat. Dice two onions into roughly 1 cm pieces and add them to the oil without rushing — you want them to soften and turn translucent over about 8 minutes, not brown. The onion sweetness is foundational to basque-cuisine. Add three finely minced garlic cloves and one red bell pepper cut into 2 cm chunks. Cook for another 2 minutes until the garlic releases its sharpness, then add 2 tbsp tomato paste. Stir it constantly for 1 minute — this maillard-reaction caramelises the paste and removes its raw metallic edge. Add 1 tsp paprika (smoked if you can get it) and turn the heat up.

Pour in 800 ml fish stock or water and bring to a rolling boil. While it heats, cut the 600 g fresh tuna into roughly 3 cm chunks. Cut 500 g potatoes into 2 cm cubes; don't peel them if they're waxy varieties like Desiree. Once the broth boils, add the potatoes and 1 tsp salt. Simmer for 10 minutes — the potatoes should be nearly tender but still hold their shape when you push a fork through. The starch they release will cloud the broth slightly, which is correct.

Gently lower the tuna chunks into the simmering broth. Do not stir aggressively; turn it once or twice to submerge. Simmer for 5 minutes — the tuna will cook through with a pale, flaky interior. Fish this delicate because overcooking tuna turns it fibrous and dry. Taste the broth and add 0.5 tsp black pepper and more salt if needed. The broth should taste of sweet onion, tomato, and the umami of the stock, not salty.

Serve immediately in deep bowls with the tuna and potatoes distributed evenly. Crusty bread is non-negotiable for soaking the broth. This is a rustic dish; it doesn't keep its texture well overnight.