Yesterday we had mackerel, done in a frying pan with next to no oil (couldn't be bothered to grill it, which would be the better option), with boiled new potatoes, broccoli and apple sauce. Gooseberry sauce is often recommended, but apple sauce is just as good, cheaper, and doable all year round.
Today we'll have atum com cebolada, tuna with onions. I won't go into details; there are many recipes available online (although none quite as good as mine).
Again, this will be served with boiled new potatoes, and for that trendy touch of (con)fusion cuisine, mushy peas.