=== LEMON MAYONNAISE ===
6 Tbs mayonnaise
1 tsp olive oil
Grated zest of 1 lemon
2 Tbs lemon juice
1 tsp minced garlic
2 Tbs chopped fresh basil leaves
=== TUNA MARINADE ===
2 Tbs extravirgin olive oil
2 Tbs lemon juice
2 tsp finely-minced garlic
Salt, to taste
Freshly-ground black pepper, to taste
4 yellowfin tuna steaks - (abt 6 oz ea)
8 slices multi-grain bread, lightly toasted
4 slices ripe tomato
4 leaves Boston lettuce or other
delicate lettuce


Combine the Lemon Mayonnaise ingredients in a bowl; refrigerate.
Combine the marinade ingredients in a bowl. Add the tuna steaks and coat them well. Let rest for up to 30 minutes, turning once.
Heat a grill pan over medium heat. Drain the tuna from the marinade and cook for 2 to 3 minutes per side for medium-rare.
To assemble sandwiches, spread one side of each slice of toast with Lemon Mayonnaise. Top 4 slices of toast with tuna, a tomato slice and a lettuce leaf. Cover with the remaining slices of toast. Serve immediately.