Ponce Panini

http://www.cookistry.com/2013/04/ponce-panini-and-some-knives-for-you.html

Ingredients
Butter
Bread
Brown mustard
Thinly sliced ponce (recipe here)
Tomato slices
Baby spinach
Smoked mozzarella

Butter the sides of the bread that will be the outsides of the sandwich. Layer the ingredients. I like to have the cheese right next to the bread, and since I wanted the spinach to wilt a bit that was right next to the cheese.
Use a sandwich press to cook and smash the sandwich (don't smash too hard or you'll have spurting tomatoes) or grill the sandwich in a pan as you would for grilled cheese, until the bread is toasted an the cheese is melted.
Slice and serve while hot.