Marmitako - cooking recipe

Ingredients

3 tablespoons olive oil
2 onions, sliced
salt to taste
3 large potatoes, peeled and sliced
ground black pepper to taste (optional)
3 large tomatoes, sliced
1 cube fish bouillon, crushed
1 pound salmon fillets

Preparation

Cover the bottom of a saucepan with olive oil. Place a layer of onion slices in the saucepan and season with salt. Add a layer of potatoes; season with salt and pepper. Add tomatoes; season with salt, pepper, and 1/2 of the fish bouillon. Place salmon on top. Add remaining tomatoes; season with salt, pepper, and remaining fish bouillon. Layer remaining potatoes and onions on top, seasoning each layer with salt and pepper.
Cover the pot and place over low heat. Cook until the top layer of onions is tender, about 45 minutes.