This little trick came from my mother-in-law, who could stretch a pound of beef and a roll of foil into a full table of happy people. These slow cooker beef and fennel foil packets use only four ingredients, but the smell when you tear open those shiny little bundles could stop conversation in its tracks. You wrap everything up, pile the packets high in the slow cooker, and let time and gentle heat do the work. It’s the kind of practical, old-fashioned supper that feels special enough for company but is easy enough for a weeknight on the farm.
Serve each foil packet right on the plate so everyone can open their own and catch that first puff of steam and aroma. A scoop of buttery mashed potatoes or egg noodles is wonderful for soaking up the fennel-scented juices, and a simple green salad or buttered peas keeps things fresh on the side. Warm dinner rolls or crusty bread are nice for mopping up the bottom of the packet. For a cozy dinner party, set the slow cooker in the center of the table and let guests reach in, choose a shiny bundle, and unwrap it themselves.
Slow Cooker 4-Ingredient Beef and Fennel Foil PacketsServings: 4
Ingredients
1 1/2 pounds beef stew meat, cut into 1 1/2-inch chunks
2 medium fresh fennel bulbs, trimmed and thinly sliced (fronds reserved if you like)
1 (1.0 ounce) packet dry onion soup mix
1/3 cup olive oil
Heavy-duty aluminum foil (for wrapping packets, not counted as an ingredient)
Directions
Prepare the fennel: Trim the fennel bulbs by cutting off the stalks and any tough outer layers. Slice the bulbs in half from top to bottom, cut out the core if it seems very hard, then slice the fennel thinly. If you like, chop a few of the feathery fronds for garnish and set them aside in the refrigerator.
Season the beef: Place the beef stew meat in a large mixing bowl. Sprinkle the dry onion soup mix evenly over the beef. Drizzle the olive oil over the top. Using clean hands or a sturdy spoon, toss until every piece of beef is well coated with the soup mix and oil. This will form the simple seasoning and sauce inside each packet.
Lay out the foil: Tear off 4 large sheets of heavy-duty aluminum foil, each about 12 to 14 inches long. If your foil is thin, use a double layer for each packet so they don’t tear in the slow cooker. Lay the sheets shiny side in (toward the food) on your counter.
Fill the packets: Divide the sliced fennel evenly among the centers of the foil sheets, making a little bed of fennel on each one. Spoon the seasoned beef over the fennel, dividing it evenly so each packet gets plenty of meat and some of the oily seasoning mixture. Try to keep everything piled in the center so you have room to seal the edges.
Seal the foil bundles: Bring the long sides of each foil sheet up over the beef and fennel so the edges meet. Fold the edges over each other several times to make a tight seam, then crimp and roll up the short ends to seal the packet completely. You want the juices to stay inside so they steam the meat and fennel. Repeat with all the packets. They should look like neat little metallic pillows.
Load the slow cooker: Place the foil packets in the slow cooker, seam side up. It’s fine to stack them; just arrange them so they fit snugly but not forced. The slow cooker should be covered mostly with shiny foil bundles, just piled up inside.
Cook low and slow: Cover the slow cooker with its lid. Cook on LOW for 7 to 8 hours, or on HIGH for 3 1/2 to 4 hours, until the beef is very tender and the fennel is soft and sweet. Avoid opening the slow cooker during cooking so you don’t lose heat.
Serve the packets: When ready to serve, turn off the slow cooker and carefully lift out the packets with tongs, as they will be hot and full of steam. Place a foil packet on each plate. Let everyone open their own at the table by carefully tearing or cutting the foil open on top, watching out for the hot steam. If you reserved fennel fronds, sprinkle a few over the exposed beef and fennel for a fresh, pretty touch, then enjoy the aroma and dig in.
Variations & Tips
You can easily adjust these packets while still keeping the spirit of the four-ingredient trick. If you’d like a little more richness, swap part of the olive oil for melted butter. For a slightly different flavor, use a garlic and herb dry soup mix instead of onion, or add a very light sprinkle of black pepper to the beef before wrapping (this would technically be a fifth ingredient, but many Midwestern cooks treat it more like a pantry staple than a recipe item). If fennel is new to you, use one bulb instead of two for a milder flavor, or mix half fennel and half thinly sliced yellow onion, still keeping the total amount about the same. For leaner meat, you can use sirloin tips or trimmed chuck roast cut into chunks; just be sure to cook long enough for it to get tender.
Food safety tips: Keep the beef refrigerated until you’re ready to assemble the packets, and wash your hands and any cutting boards or knives that touch the raw meat with hot, soapy water. Make sure the foil packets are tightly sealed so raw juices don’t leak in the refrigerator or slow cooker. If you assemble the packets ahead of time, store them in the refrigerator for no more than 24 hours before cooking, and place them directly into the slow cooker from the fridge. The internal temperature of the beef should reach at least 145°F, though most stew cuts will be much more tender if they reach 190°F or higher, which they typically do during the long slow-cooking time. Refrigerate any leftovers within 2 hours, and reheat thoroughly until steaming hot before eating.
