Les Mouettes d'Arvor is located in Brittany France. Yes, we realize these is quite some way from the Iberian Peninsula, but they make these very tasty fish rillettes (pates). They are a family owned company that is now run by the third generation.
This is mackerel with mustard sauce and is mighty tasty on a a bit of toast.
Ingredients: mackerel 58%, marinade (white
wine vinegar (sulphites) and alcohol, white wine (sulphites), flavor,
sunflower oil, mustard 8%, water, onion puree, salt, stablizers: guar
and flour of locust bean seeds.