Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
  12      slices        French bread -- sliced on the
                        diagonal into 1/2"-thick slices
                        olive oil -- as needed
  12                    thinly-sliced pieces serrano ham
  12                    thinly-sliced pieces manchego cheese
                        whole-grain mustard

Preparation:

Preheat grill. Brush each slice of bread on one side with olive oil and grill, oil-side down until lightly golden brown. Turn over and divide cheese among bread slices. Top each slice of cheese with the slices of ham and grill until the cheese begins to melt. Serve with the mustard.