Grilled Romaine Salad - The Local Palate

Ingredients

• ½ medium red onion, finely diced
• 1 teaspoon Dijon mustard
• ½ cup red wine vinegar
• Salt and pepper
• 1 cup olive oil, plus extra for grilling
• 4 heads romaine lettuce, outer leaves removed, trimmed, rinsed, and patted dry
• ¼ pound guanciale, sliced into ¼-inch strips
• 1 apple (honeycrisp or gala), cut into matchsticks
• ¼ pound Pecorino Stagionato (or other firm Italian cheese)