Darra's Famous Tuna Waldorf Salad Sandwich Filling

Ingredients (14)

• + ½ cup mayonnaise add to pantry
• ✓ 1 tablespoon prepared Dijon-style mustard
• + ¼ teaspoon curry powder add to pantry
• ✓ salt and pepper to taste
• + salt and pepper to taste add to pantry
• ✓ 1 (5 ounce) can tuna, drained
• + 1 shallot, finely chopped add to pantry
• + 1 Granny Smith apple, cored and diced add to pantry
• + ¼ cup chopped walnuts add to pantry
• + ½ cup diced celery add to pantry
• + 1 teaspoon sweet pickle relish add to pantry
• + 4 large croissants add to pantry
• + 4 leaves lettuce add to pantry
• + 4 slices Swiss cheese add to pantry