For the tuna salad
01 -
2 (5 oz / 140 g) cans tuna in water, drained
02 -
3 tablespoons mayonnaise
03 -
2 tablespoons celery, finely diced
04 -
1 teaspoon Dijon mustard
05 -
Salt and black pepper to taste
For assembly
06 -
4 slices sturdy bread (sourdough or country loaf)
07 -
2 tablespoons unsalted butter, softened
08 -
4 oz (115 g) sharp cheddar cheese, sliced or shredded
09 -
1 small tomato, thinly sliced (optional)