Suppose How to make the perfect grilled cheese sandwich<br>Spread butter on one side of each slice of bread. Place one slice, butter-side down, in a heated skillet. Add cheese on top of the bread, then place the second slice of bread on top, butter-side up. Cook until both sides are golden brown and cheese is melted.
Can we infer that "Grilled cheese sandwiches are always made with mustard"?