1/3 cup chopped celery |
3 tablespoons light mayonnaise |
2 tablespoons dijon mustard |
2 teaspoons lime juice |
1/2 teaspoon coarsely ground black pepper |
1 (12-ounce) can solid white tuna in water, drained |
4 english muffins, split and toasted |
8 (1/4-inch-thick) slices tomato |
1/2 cup (2 ounces) shredded reduced-fat swiss cheese |