Best Ever Mushroom Sauce

Best Ever Mushroom Sauce

Best Ever Mushroom SauceIngredients30 g butter2 tbsp olive oil1 large brown onion, finely chopped200 g cup mushrooms, trimmed, quartered200 g Swiss brown mushrooms, trimmed, quartered2 tbsp plain flour1 ½ cups beef stock⅔ cup thickened cream1 tsp Dijon...