Preheat the oven to 300 degrees
Wash and slice the tomatoes
Add butter to bowl
Microwave the butter until it is melted
Add a pinch of basil to butter bowl
Crush 2 garlic cloves
Add garlic cloves to butter bowl
Grab the French bread
Cut the bread into slices
Brush the butter mixture onto the bread
Add cheese to the bread
Add the tomato to the bread
Add the corned beef to the bread
Add a pinch of rosemary to sandwich
Add the aluminum foil to a baking sheet
Put sandwiches on the baking sheet
Cook for 3 minutes