
Savory mushroom gravy that's 100% meat-free and perfect for drowning over creamy mashed potatoes.
Melt butter in a large skillet over medium-high heat. Add onion, mushrooms, and sprinkle of salt. Cook for 6-7 minutes until onions are soft and translucent and mushrooms are light golden brown. Add garlic and cook for 2 more minutes until fragrant. Stir in fresh thyme and flour. Cook for 1 minute to cook off raw flour taste.
Deglaze pan with the vinegars and tamari. Stir in broth. Bring to a low boil, reduce heat to simmer, and simmer for 15 minutes until the sauce has thickened and reduced. Season with salt and pepper as desired (I added ~½ tsp kosher salt and few turns of freshly cracked black pepper).