Tuna Melt

1: Combine tuna, celery, cucumber, red onion, chopped artichoke hearts, Dijon mustard, mayo, lemon juice, salt, and pepper in a bowl.

2: Mix well to combine all ingredients.

3: Spread the mixture on one slice of bread and top with cheese.

4: Place another slice of bread on top.

5: Heat oil and butter in a pan over medium heat.

6: Cook the sandwich on each side until the bread is golden brown and the cheese is melted.