Cherry Tomato Onion Conserve

Ingredients

• 2 tablespoons butter
• 2 tablespoons olive oil
• 2 lbs sweet onions, quartered and thinly sliced
• 2 teaspoons sea salt
• 1 teaspoon sugar
• 2 pints cherry tomatoes, halved
• 3 ⁄ 4 cup honey
• 1 ⁄ 4 cup Celia's Traditional balsamic vinegar
• 1 ⁄ 2 teaspoon fresh ground black pepper