Low-Carb Caramelized Onion Gravy Without Flour

This recipe delivers rich flavor and satisfying texture without a single grain of flour. It’s perfect for anyone seeking a low-carb, keto, or gluten-free alternative that doesn’t skimp on taste. Try it and see how easy it is to upgrade your meals!

8 servings

Gravy without flour being poured over potatoes

Prep Time 10

Cook Time 45

Total Time 55

Ingredients

1 tablespoon olive oil
2 (220 g) medium onions, peeled and sliced thinly
1½ cups (341 g) water or broth - chicken, beef, or veggie (see notes)
1-2 tablespoons butter
½ teaspoon table salt
¼ teaspoon freshly ground black pepper

Instructions

Carmelize the Onions:

Heat a medium to large skillet over medium heat. For best results, use a heavy skillet. Add 1 tablespoon olive oil, then 2 medium onions, peeled and sliced thinly.
Stir frequently, especially at the beginning and end of the cooking process to prevent burning. Cook until the onions caramelize and turn a deep brown color. This will take 30-45 minutes. Onions will reduce to about 1/2 cup when fully caramelized. This step can be done ahead of time and frozen for convenience.

Prepare the Broth:

Transfer the caramelized onions to a blender.
Add 1½ cups water or broth of your choice to the same skillet you used for onions. Bring to a boil while scraping up browned bits from the skillet. Pour the deglazed broth into the blender, reserving about 1/4 cup of the liquid.
Place onions into a blender. Add 1½ cups water or broth of your choice to the same skillet you used for onions. Boil until all brown bits have dissolved into the water or broth. Add water or broth to blender containing onions saving back about a fourth cup.

Blend the Gravy:

Blend the onions and broth starting on low speed, then gradually increase to high until smooth. Stop to scrape down the sides of the blender with a spatula.
Add 1-2 tablespoons butter for a smoother texture and blend again. Adjust the thickness by adding more liquid if needed.

Season and Finish:

Add ½ teaspoon table salt and ¼ teaspoon freshly ground black pepper to taste. (If your broth is extra salty, you may not want to add any salt) My husband requires lots of pepper so there's that, too.
Optional: Add herbs like thyme or parsley, or stir in a tablespoon of sour cream or Greek yogurt for extra flavor.

Notes

Pro Tips for Success

Caramelize Ahead of Time: Freeze caramelized onions in small portions for quick use later.
Deglaze for Extra Flavor: Use water or broth to scrape up any browned bits from the pan after caramelizing onions.
Make It Your Own: Adjust the consistency with more broth or onion puree to suit your preferences.
Use Homemade Broth: That way you'll know exactly what's in it.
Adding sour cream or yogurt? Start with a couple of tablespoons.

Nutritional Information