E asy Crockpot French Onion soup is filled with flavor and tastes amazing. The slow cooker makes this recipe so easy to make.

1 tablespoon apple cider vinegar. 6 ounces freshly grated Gruyere. Peel and slice the onions, reserving the outside papery skins. Place the onion skins in a pot. Add the chicken stock and bring to ...

Store your leftover French onion soup, without the bread and cheese, in an airtight container in the refrigerator for up to 4 days, or in the freezer for up to 3 months.

Method. Melt the butter and oil in a deep saucepan. Add the onion and fry over high heat for a few minutes. Cover, lower the heat and simmer for about 10 minutes.