Cheddar Biscuit Egg Sandwich

Ingredients

• 4 Applewood Smoked Chicken sausage, butterflied
• 3 tbsp red wine vinegar
• 1 tsp Dijon mustard
• 1 tsp honey
• 1/2 tsp kosher salt
• 1 tbsp unsalted butter, plus more for buns
• 4 large eggs
• Half pinch freshly ground black pepper
• 2 small heads of frisée
• 1/3 cup cheddar, crumbled
• 2 cups all-purpose flour
• 1 tbsp sugar
• 2 1/2 tsp baking powder
• 1 tsp pepper
• 1/2 tsp baking soda
• 1/2 tsp salt
• 6 tbsp chilled unsalted butter, cut into 1/2-inch pieces
• 1 1/4 cups grated extra-sharp cheddar cheese
• 1 cup cold buttermilk
• 1 egg beaten
• 1 tbsp unsalted butter
• 1 large onion, finely chopped
• 4 green apples, peeled, cored and cut into ½-inch wedges
• 2 tbsp grated ginger
• 1/4 cup cider vinegar
• 2 tbsp dark brown sugar
• 1 tbsp grainy mustard
• 1 tsp chopped thyme
• Pinch salt and pepper