Caramelized Onion White Bean Dip | Umami

Ingredients

• 1 tbsp butter
• 1 med. onion (sliced into thin slivers)
• 1 15 oz can white beans (such as Cannellini, Great Northern, or Navy)
• 1/4 cup parsley
• 1/2 tsp salt ((plus more as needed))
• 1/2 tsp red pepper flakes
• 1 tsp white wine vinegar
• 1 tbsp olive oil