Don’t want to make this in your crock pot? Sauté the seasoned onions in a large stockpot over medium–low heat instead until very caramelized, about one hour. (If you need some more oil, use vegetable oil, which won’t burn.) Add the herbs and wine and let reduce until almost completely evaporated, then add in flanken and chicken stock. Cook, covered, over medium heat until the flanken is falling off the bone, about two hours.

This can be made ahead, then refrigerated for three to four days or frozen for two to three months. Skim the excess fat off the top before reheating.