Wash the fish fillets, pat dry and drizzle with lime or lemon juice. Halve the olives. Remove the kernels and the white inner walls from the peppers and cut into very small pieces. Finely chop the onion and sauté in olive oil until translucent. Deglaze with a dash of orange juice. Add the tomato, capers and olives and press the garlic into the sauce. Season to taste with salt, pepper and cumin.
Cook the fish fillets on the sauce for about 6-8 minutes. Serve sprinkled with finely chopped coriander.