Cookwith - Ultimate SFAH-Inspired Burger with Pickled Cucumbers and Cheddar

Ingredients

• 1 1/2 lbs ground beef (80/20 blend for juiciness)
• 1 tsp kosher salt
• 1/2 tsp freshly ground black pepper
• 1 tbsp olive oil
• 4 brioche or potato burger buns
• 2 tbsp unsalted butter, softened
• 4 slices sharp cheddar cheese
• 1 small red onion, thinly sliced
• 1 large heirloom tomato, sliced
• 4 leaves butter lettuce
• 1/4 cup pickled cucumbers or cornichons, sliced
• 2 tbsp mayonnaise
• 1 tbsp Dijon mustard
• 1 tbsp ketchup