Melt the butter in a large skillet over medium heat.
Add the onions, jalapenos, garlic, Worcestershire sauce, sugar and salt and pepper to taste.
Cover and cook 15-20 minutes until the onions are softened and golden in color. Stir often.
Add the heave cream and stir. Cook for 2 more minutes.
Add the apple cider vinegar and season with salt and pepper to taste.
Stir and serve.