Preheat and oil the grill. Place the chicken breasts in a glass baking dish. Stir together the olive oil, vinegar, and 1 tablespoon basil. Pour over the chicken and toss to coat well. Set aside 15 minutes.
2
Season the chicken with sale and pepper to taste. Grill, skin side down, over direct medium-high heat about 5 minutes on each side or until the chicken is cooked through. Remove chicken from the grill and set aside.
3
Lightly brush one side of each bread slice with oilive oil. Grill, oiled side down, 1 miute or just until marked and golden Turn and grill the other side 1 minute.
4
Sitr together the mayonnaise and the remaining basil. Place 4 slice of the bread, oiled sid eup, on a work surface. Generously coat each piece with basil mayonnaise.
5
Remove the skin from the chicken and cut each breast on the bias into thin slices, keeping each breast together. Lay 1 breast on each mayonnaise-covered bread slice. Top each with lettuce, w slices of tomato, and 3 strips of bacon.
6
Coat the oiled side of the remaining 4 slices of bread with the remaining mayonnaise. Top each sandwich, pressing down to compact slightly. Cut the sandwiches in hald and serve.