Finely slice 5 lbs of onions. Add the onions to a skillet with oil and cook over low heat for two to three hours, stirring often. The secret to making this richly flavored soup is to caramelize the onions well. Next add the onions to a stock pot with 2 qts of broth. Add a bit of Better Than Bouillon. Finally simmer for a couple of hours. This is our go-to immunity booster.