Tuna à la catalane - Tender and mild tuna recipe

A delicious way to eat tuna, either hot or cold on toast.
Slow cooking in a pot over low heat keeps the tuna tender, while the sauce makes it tasty.
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Ingredients:
2 tuna steaks, approx. 1kg
2 onions
3 peppers
1 can tomato pulp
5 garlic cloves
olive oil
3 teaspoons capers
A few gherkins
3 bay leaves
1 tablespoon cider vinegar
Provencal herbs