This easy caramelized onion mushroom gravy is a rich, flavorful sauce that elevates any dish from mashed potatoes to roasted vegetables or meats. The natural sweetness of slowly caramelized onions combined with earthy mushrooms creates a deeply savory gravy that’s simple to make and ready in under 30 minutes.
Ingredients
- 2 large yellow onions, thinly sliced (about 2 cups)
- 8 ounces cremini or white mushrooms, sliced
- 3 tablespoons unsalted butter
- 2 tablespoons olive oil
- 2 cloves garlic, minced
- 2 tablespoons all-purpose flour
- 2 cups vegetable broth (or beef broth for a meatier flavor)
- 1 teaspoon fresh thyme leaves (or ½ teaspoon dried thyme)
- 1 tablespoon soy sauce or tamari (for umami depth)
- Salt and freshly ground black pepper, to taste
- Optional: 1 teaspoon balsamic vinegar or Worcestershire sauce for added complexity
Instructions
- Heat the butter and olive oil together in a large skillet over medium-low heat. Add the sliced onions and a pinch of salt, stirring occasionally. Cook slowly for 20-25 minutes, allowing the onions to caramelize and turn a deep golden brown. Stir more frequently toward the end to prevent burning.
- Add the sliced mushrooms to the caramelized onions. Increase the heat to medium and cook for 6-8 minutes, stirring occasionally, until the mushrooms are browned and have released their moisture.
- Stir in the minced garlic and cook for 1 minute until fragrant, taking care not to burn it.
- Sprinkle the flour evenly over the onion-mushroom mixture. Stir well to coat and cook for 2 minutes to remove the raw flour taste. This step helps thicken the gravy later.
- Gradually pour in the vegetable broth while continuously stirring or whisking to avoid lumps. Bring the mixture to a gentle boil, then reduce heat to low and simmer for 5-7 minutes until the gravy thickens to your desired consistency.
- Add the thyme, soy sauce, and optional balsamic vinegar or Worcestershire sauce. Season with salt and pepper to taste. Stir well and simmer for another 2 minutes to meld the flavors.
- Remove from heat. For a smoother gravy, you can blend it briefly with an immersion blender or regular blender, but it also tastes excellent chunky with visible mushrooms and onions.
- Serve warm over mashed potatoes, roasted vegetables, grilled meats, or use as a savory sauce for vegetarian dishes.
Tips
- Substitutions: Use shallots instead of onions for a milder flavor. For a gluten-free version, substitute all-purpose flour with cornstarch or a gluten-free flour blend, adjusting quantities to thicken properly.
- Storage: Store leftover gravy in an airtight container in the refrigerator for up to 4 days. Reheat gently on the stovetop or microwave, stirring occasionally and adding a splash of broth or water if too thick.
- Caramelizing onions: Be patient when caramelizing onions; cooking them low and slow is key to developing sweetness and depth. Avoid turning the heat too high, or they may burn and taste bitter.
- Consistency: If your gravy is too thick, whisk in extra broth or water a tablespoon at a time until you reach your preferred texture. If too thin, simmer a little longer or mix a slurry of flour and water to thicken.
Serving Suggestions
This caramelized onion mushroom gravy pairs beautifully with classic comfort foods. Pour it over creamy mashed potatoes or roasted root vegetables for a hearty vegetarian meal. It complements grilled or roasted chicken, pork chops, and even steak, adding a savory richness. Try it spooned over vegan meatloaf or lentil patties for a flavorful plant-based option. It also works well as a sauce for savory pies or poured over biscuits for a satisfying brunch.
Variations
To customize this gravy, consider adding fresh herbs like rosemary or sage for a more aromatic profile. For a smoky twist, incorporate a teaspoon of smoked paprika or a splash of liquid smoke. Swap out cremini mushrooms for shiitake or portobello to introduce a different texture and flavor depth. For a creamier version, stir in a few tablespoons of heavy cream or coconut milk at the end of cooking. To make it vegan, substitute butter with vegan margarine or additional olive oil and ensure broth is vegetable-based.
Storage and Reheating
Store the gravy in an airtight container in the refrigerator for up to 4 days. For longer storage, freeze it in a freezer-safe container or heavy-duty zip-top bag for up to 3 months. When freezing, leave some headspace to allow for expansion. To reheat, thaw overnight in the fridge if frozen. Warm gently on the stovetop over medium-low heat, stirring frequently to prevent sticking and adding a splash of broth or water if the gravy has thickened too much. Avoid boiling after reheating to maintain a smooth texture.
Frequently Asked Questions
Can I make this gravy ahead of time?
Yes, this gravy can be made a day or two in advance. Store it in the refrigerator and reheat gently before serving. Flavors often deepen after resting, making it even more delicious.
What if I don’t have fresh mushrooms?
While fresh mushrooms provide the best texture and flavor, you can use dried mushrooms rehydrated in warm water. Drain and chop them before adding, and reduce the broth slightly to account for the extra liquid.
How do I prevent lumps when adding flour?
Sprinkling the flour evenly over the fat and stirring well before adding liquid helps prevent lumps. Whisking the broth in gradually while stirring or whisking vigorously also ensures a smooth gravy.
Is this gravy suitable for vegans?
It can be made vegan by using olive oil or vegan butter instead of butter and ensuring the broth is vegetable-based. Avoid Worcestershire sauce unless you use a vegan version, or omit it entirely.
Can I use this gravy with other vegetables?
Absolutely. It complements roasted cauliflower, steamed green beans, or even drizzled over baked sweet potatoes. Its rich flavor enhances many vegetable dishes.
How thick should the gravy be?
The gravy should be pourable but thick enough to coat the back of a spoon. If it’s too thin, simmer longer or add a bit more flour slurry. If too thick, thin with broth or water as needed.
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