Smoked Steak and Cheddar Panini

Ingredients

• 1 yellow onion, thinly sliced
• 3 garlic cloves, chopped
• 1/4 tsp. red pepper flakes
• 1 bay leaf
• 2 Tbs. chopped fresh flat-leaf parsley
• 2 tsp. dried oregano
• 4 Tbs. red wine
• 6 Tbs. olive oil
• 1 tsp. salt
• Freshly ground pepper, to taste
•  
• 1 1/4 lb. skirt steak
• 1 Tbs. olive oil
• 1 red bell pepper, seeded, cored and sliced 1/4 inch thick
• Salt
• freshly ground pepper
• 4 French sandwich rolls
• 2 Tbs. unsalted butter, melted
• 5 oz. extra-sharp cheddar cheese, grated
• 1 head butter or Bibb lettuce, leaves separated