Before ovens were part of every home in France people would drop their Sunday roast off at the local baker, surrounded by sliced onions and potatoes, on the way to church. On their way home they would pick up the cooked meal ready to enjoy! This is a slow cooker version. I'm sure you'll love this. If you love potatoes and onions how could you not? Recipe found in The 150 Best Slow Cooker Recipes. You can partially prepare this dish the night before. Complete the first 4 steps and refrigerate overnight. The next day you simply continue cooking as directed in step 5. This dish is even better if you use a really good homemade stock but commercial stock works well, too.