Skillet White Beans

Ingredients

• 1 large sweet onion, halved lengthwise and thinly sliced (2 cups)
• 3 tablespoons butter
• 1/2 cup maple-flavored syrup
• 1/3 cup white balsamic vinegar or 1/3 cup lemon juice
• 2 tablespoons packed brown sugar
• 2 tablespoons snipped fresh sage
• 2 tablespoons tomato paste
• 1 teaspoon salt
• 1/2 teaspoon fresh ground black pepper
• 2 (16 ounce) cans navy beans, rinsed and drained
• 2 (16 ounce) cans butter beans, rinsed and drained
• 1 (16 ounce) can garbanzo beans, rinsed and drained (chickpeas)
• sour cream
• tomatoes, chopped (optional)
• sage leaf (optional)