Prepare spaghetti in boiling salted water according to package instructions. Peel and dice the shallot. Clean, wash and cut the peppers into strips. Wash thyme, shake dry and, except for a stalk, pluck leaves from the stalks.
Heat the oil in a coated pan. Sauté the shallots cubes until translucent, add the paprika and pour on the stock. Add capers, tuna and thyme. Stir starch with 1 tablespoon of water until smooth. Bring sauce to the boil and thicken with starch.
Season to taste with salt and pepper. Fold in the pasta and arrange on a plate. Garnish with thyme.