Ingredients:

  • 2 large yellow onions, thinly sliced (approx. 1 lb / 450g)
  • 3 tbsp unsalted butter
  • 1 tbsp olive oil
  • 1/4 tsp baking soda
  • 1/2 tsp salt
  • 1 cup full-fat sour cream
  • 1/4 cup mayonnaise
  • 1/2 tsp garlic powder
  • 1/4 tsp black pepper
  • 1 tsp Worcestershire sauce

Instructions:

  1. Melt the butter and olive oil in a skillet over medium-high heat. Add the sliced onions and salt.
  2. Stir in the baking soda once onions soften. Cook, stirring occasionally, for 15-20 minutes until onions reach a deep mahogany-brown, jammy consistency.
  3. Transfer caramelized onions to a plate and let them cool completely.
  4. In a medium bowl, whisk together the sour cream, mayonnaise, garlic powder, black pepper, and Worcestershire sauce until smooth.
  5. Gently fold the cooled onions into the cream mixture using a spatula until evenly distributed.
  6. Cover and refrigerate for at least 1 hour before serving to allow flavors to meld.