Gourmet Grilled Cheese with Pickled Beets – Welcome Home Des Moines

Ingredients

• 3 tablespoons butter
• 3 tablespoons olive oil
• 3 large yellow onions (halved, sliced ¼ inch thick)
• 1–2 tablespoons water (optional)
• 1 tablespoon brown sugar
• 1 tablespoon balsamic vinegar
• 1/8 teaspoon salt
• 1/8 teaspoon black pepper
• 1/8 teaspoon red pepper flakes
• 8 large ½-inch-thick slices sourdough slices bread
• 1/8 cup mayonnaise
• 4 ounces fresh goat cheese (at room temperature)
• 8 ounces shredded Gruyère cheese (at room temperature)
• 1 jar pickled beets (about 32 beets)
• 2 cups fresh baby arugula
• 2 tablespoons butter
• 2 tablespoons olive oil