BLT Sandwich Salad

Name: BLT Sandwich Salad
Ingredients: 1 head romaine lettuce, thinly sliced (about 6 cups); 1/2 cup chopped red onion; 2 Roma tomatoes, seeded and chopped; 4 slices white bread; 1 tablespoon unsalted butter; 1/4 cup packed light brown sugar; 1 teaspoon Hungarian paprika; Grated zest of 1 lemon; 1 teaspoon black peppercorns, crushed in a bag with a mallet; 6 strips center-cut bacon; 6 sprigs fresh thyme; 1/2 cup mayonnaise; 1 to 2 tablespoons maple syrup; 4 teaspoons whole-grain mustard; 1 tablespoon fresh lemon juice