For the tuna salad
01 -
2 (5 oz / 142 g) cans solid white albacore tuna in water or olive oil, drained well
02 -
3 tablespoons mayonnaise
03 -
1 teaspoon Dijon mustard
04 -
1 medium fresh jalapeño, seeded and finely chopped
05 -
2 green onions, thinly sliced
06 -
1/4 teaspoon salt
07 -
1/4 teaspoon black pepper
08 -
1 tablespoon fresh lemon juice
For assembly
09 -
4 slices sturdy sourdough or whole-grain bread
10 -
1 tablespoon unsalted butter, softened
11 -
4 oz (115 g) sharp cheddar cheese, sliced or shredded