1: Preheat Panini grill or frying pan to high. Spread 1 slice of bread with mustard, top with pickles, ham, and cheese. Cover with remaining slice of bread. Spread top outside slice with ½ of butter. Place butter side down in hot grill or frying pan and carefully spread butter on remaining side of bread. Grill or cook (and press down) 1-2 minutes, until cheese is melted and bubbly. Cut into triangles and garnish with cocktail onions and gherkins.