Steak Panini with Gruyère and Savory Onion Jam

INGREDIENTS

New york strip steaks, each about 12 oz. (375 g)

Bibb lettuce, leaves

Tomato, thick slices

4 tbsp

Mustard, whole-grain

1/2 cup

Williams-sonoma savory red onion jam

Salt and freshly ground pepper

2 tbsp

Olive oil

slices Bread, country-style

6 oz

gruyère, grated (about 1 1/3 cups)