1. Combine all ingredients in a large mixing bowl.
2. With wet hands, form walnut-sized balls and set aside in a pan. Keep balls refrigerated until one hour before Shabbos. Place meatballs gently into simmering cholent, adding water to your slow cooker so that the meatballs are immersed in the liquid.
3. If you aren’t making this for Shabbos and would like to make Crock-Pot meatballs on their own, do as follows: Dice an onion and place on the bottom of a slow cooker, along with a bit of oil. Turn the slow cooker to low setting. Place meatballs over diced onion and add water to cover at least half of each ball. Drizzle with ketchup and sprinkle generously with salt and pepper. Cover slow cooker and cook on low for six to eight hours. Remove from heat and serve.