In Mexico, tortas are popular sandwiches made from crusty rolls layered with refried black beans, sliced avocado, pickles, salsas and grilled meat or cheese. The combination of these ingredients, with their acid, crunch, salt and smoke, make for a heady combination. If you find yourself near the sea over the summer, try giving line-caught fish the torta treatment for something that’s way more than the sum of its parts.