Preheat a panini press.

(Alternatively, you can use a grill pan or skillet if you don't have one.).

Spread butter on one side of each slice of bread.

In a small bowl, mix mayonnaise and dijon mustard together. On the non-buttered side of the bread, spread the mixture on each slice.

Layer the bread with ham, apple slices, and swiss cheese. Flip the remaining slices of bread butter side up on top to complete the sandwiches.

Cook the sandwiches on the panini press, pressing down firmly for 5 seconds and leaving it to cook for approximately 3 minutes, or until golden brown on the outside and the cheese is melted on the inside.

Cut in half and serve with grapes and sparkling water.