Food & Cooking Recipes Healthy Recipes Gluten-Free Recipes Caramelized Onions Be the first to rate & review! By Martha Stewart Test Kitchen Martha Stewart Test Kitchen The recipes developed by our test kitchen team have undergone a rigorous process of development and testing, ensuring that every element is optimal, from ingredient amounts to method and cooking time. This process includes triple-testing recipes to ensure they meet our high standards. The many stellar cooks and food editors who have been part of our team include Sarah Carey, Lucinda Scala Quinn, Jennifer Aaronson, Shira Bocar, Anna Kovel, Greg Lofts, Riley Wofford, Lauren Tyrell, and Lindsay Leopold. Editorial Guidelines Updated on March 23, 2021 Print Rate It Share Share Tweet Pin Email Yield: 2 cups These slightly sweet onions are a flavorful topping for pizzas and pastas or as a sandwich condiment. To achieve a melt-in-your-mouth quality, the onions need to be cooked very slowly. Ingredients 2 tablespoons unsalted butter 3 medium to large red onions, sliced ¼ inch thick 1 teaspoon sugar Coarse salt and freshly ground pepper Directions Heat butter in a large skillet over medium heat. Add onions, and sprinkle with sugar. Cook, stirring frequently, until soft and golden brown, about 1 hour, reducing heat to medium-low about halfway through. If onions begin to stick to skillet, add 1 to 2 tablespoons water. Remove from heat, and season with salt and pepper. Let cool before using. Rate it Print