3 tablespoons finely chopped red onion |
3 tablespoons organic canola mayonnaise |
1 teaspoon grated lemon rind |
1/4 teaspoon fennel seeds, crushed |
1/4 teaspoon freshly ground black pepper |
3 slices center-cut bacon, cooked and crumbled |
2 (5-ounce) cans albacore tuna in water, drained and flaked |
8 slices sourdough bread |
4 (1/2-ounce) slices provolone cheese |
cooking spray |