For a great sandwich filling, spike canned tuna with salty olives and capers, bright lemon juice and tangy feta.
- Have four 15-ounce cans and a medium skillet (not nonstick) ready by the stove.
- Place tuna in a medium bowl and flake with a fork. Add tomato, feta, artichokes, onion, olives, capers, lemon juice and pepper; stir to combine. Divide the tuna mixture among 4 slices of bread (about 1/2 cup each). Top with the remaining bread.
- Heat 1 teaspoon canola oil in a large nonstick skillet over medium heat. Place 2 panini in the pan. Place the medium skillet on top of the panini, then weigh it down with the cans. Cook the panini until golden on one side, about 2 minutes. Reduce the heat to medium-low, flip the panini, replace the top skillet and cans, and cook until the second side is golden, 1 to 3 minutes more. Repeat with another 1 teaspoon oil and the remaining panini.