Ingredients

• 1 teaspoon yellow mustard
• 1 (6 1/2 ounce) can tuna, drained
• 1 -2 tablespoon mayonnaise
• 1/2 teaspoon salt
• 1 teaspoon onion, finely chopped
• 4 slices whole wheat bread
• 1 tablespoon celery, finely chopped
• 1 tomatoes, sliced thinly
• 1 teaspoon sweet pickle relish (or dill)
• 2 lettuce leaves
• 1 teaspoon Dijon mustard
• 1 hard-boiled egg, chopped