Stuffed mussels, or tigres, are one of the most popular tapas in northern spain. Mussels are finely chopped and mixed with onion, pepper, tomato sauce to form a delicious filling. They are then breaded and lightly fried. This version separates the filling from the bchamel sauce, rather than mixed in with it. Although it takes a bit more time to prepare, the filling has more flavor and the crust is crispier due to two layers of breadcrumbs. Prep tip: to finely chop hardboiled egg without making a mess on the cutting board, place the hardboiled eggs in a 16-ounce wide mouth glass. Then, holding the knife vertically cut eggs into small pieces. Turn the glass every 3-4 cuts and the eggs will quickly be chopped into tiny pieces.