In a large skillet, melt 4 Tbsp of butter and add the chopped onion on low heat. Stir and cook until tender and the onions turn a golden brown, for about 1 hour. Set your time so they don’t burn or get too brown, and stir every 15 minutes.
Add the remaining 1 cup (2 sticks) of butter. Allow to melt and continue cooking until the mixture is brown, another 10 minutes.
Remove from the heat and add a splash or two of vinegar, and 2 tsp of coconut sugar; stir until combined.
Transfer the mixture to a small dish and allow to cool for an hour. Sprinkle with a TINY BIT of fresh chopped thyme (to add color).
Use for a dip with chips, crackers or veggies, or smear on just-grilled chicken or steak.