12 cups onions, sliced (not too finely)
4 Tbsp butter
2 tsp salt
1 tsp baking soda
1 tsp pepper

1. Mix together all the ingredients.
2. Sauté for five minutes in the instant Pot.
3. Cook on high pressure for 20 minutes. Then do a quick release.
4. Sauté (while draining excess liquid occasionally) for about ten more minutes until the onions have a nice caramelized appearance.
5. Freeze in small portions to use in future recipes.

Note: I got four cups of caramelized onions and one cup of liquid.