butter over medium heat. Add the sliced onions and 1/2 teaspoon of the salt. Cook, stirring occasionally, for 20–25 minutes, lowering the heat if they start to brown too quickly. If they seem dry or start to scorch, add 1 tablespoon olive oil and a splash of water. Sprinkle in the optional 1 teaspoon sugar if you’d like to speed up caramelizing. Continue cooking until the onions are soft, golden brown, and sweet-smelling. Remove from heat and let cool slightly.
Make the creamy
