Tomato Caramelized Onion Conserves

• 2 tablespoons butter, unsalted
• 2 tablespoons olive oil
• 2 1/2 lbs sweet onions, quartered then sliced thinly
• 3 garlic cloves, sliced thinly
• 2 teaspoons salt
• 1 teaspoon packed light brown sugar
• 10 cups diced tomatoes
• 3/4 cup honey
• 1 teaspoon diced fresh rosemary
• 1 teaspoon fresh thyme leave
• 1 1/2 teaspoons black pepper
• 1/4 teaspoon red pepper flakes
• 1/3 cup white balsamic vinegar

1. In a large pan heat the butter and oil. Add onion, garlic, salt and sugar cook over medium-low heat till golden brown about 20-30 minutes.
2. Add tomatoes bring to a boil then reduce heat to simmer for 15 minutes. Softening the tomatoes and reduce the liquid. Add remaining ingredients bring back up to a boil then remove from heat.
3. Ladle into sterilized jars leaving 1/4 inch head space. Wipe rims and adjust lids. Process the jars for 5 minutes.
4. Remove from canner and let cool.

butter, olive oil, sweet onions, garlic, salt, brown sugar, tomatoes, honey, rosemary, thyme, black pepper, red pepper, white balsamic vinegar

Taken from www.food.com/recipe/tomato-caramelized-onion-conserves-507399 (may not work)