My grandmother passed down this secret Sunday dinner and the savory gravy takes exactly 3 ingredients

This oven baked 3-ingredient French onion beef bake is the kind of humble Sunday supper that quietly steals the show. My grandmother used to slip this into the oven before church, and by the time we hung up our coats, the whole farmhouse smelled like caramelized onions and slow-roasted beef. The secret she swore by was that the savory gravy must be exactly three ingredients—nothing fancy, nothing fussy—just good beef, onion flavor, and time. The result is tender pulled beef chunks nestled in a glass casserole dish, smothered in a rich brown onion gravy that tastes like it cooked all day on a woodstove. It’s simple enough for a busy weeknight, but comforting and special enough to carry on as a Sunday tradition.

Serve this beef spooned over fluffy mashed potatoes, buttered egg noodles, or thick slices of white bread so every drop of that onion gravy has somewhere to go. A simple side of buttered green beans, sweet corn, or a crisp lettuce salad balances the richness nicely. On Sundays, I like to set it out right in the glass casserole dish and let everyone help themselves, passing a basket of warm dinner rolls to mop up the last of the gravy.

Servings: 6

3 pounds beef chuck roast, cut into large chunks (about 2- to 3-inch pieces)

Preheat your oven to 300°F (150°C). Set out a 9x13-inch glass casserole dish or similar oven-safe glass baking dish.

Trim any excess hard fat from the chuck roast, then cut the roast into large chunks about 2 to 3 inches in size. This helps the beef cook evenly and makes it easy to pull apart later.

Place the beef chunks in a single, snug layer in the bottom of the glass casserole dish. It’s fine if they touch; just avoid stacking them too high.

Pour the condensed French onion soup evenly over the beef chunks, making sure each piece is moistened. Do not dilute the soup; it will thin out as the beef releases its juices.

Sprinkle the dry onion soup mix evenly over the top of the beef and soup. This will help deepen the onion flavor and season the gravy as it bakes.

Cover the glass casserole dish tightly with a double layer of foil, crimping the edges well so steam cannot escape. This trapped steam is what helps the beef become fall-apart tender and keeps the gravy rich.

Place the covered dish on the center rack of the preheated oven and bake for 3 to 3 1/2 hours, or until the beef is very tender and easily pulls apart with a fork. Avoid opening the foil during this time so the heat and moisture stay inside.

Carefully remove the casserole dish from the oven and peel back the foil away from you to avoid the hot steam. The beef should be sitting in a rich brown onion gravy.

Using two forks, gently pull and break the beef into chunky pieces right in the dish, stirring it lightly into the onion gravy so every piece is coated. Taste the gravy and, if desired, add a small pinch of salt or pepper, though the soup mix usually seasons it well enough.

Let the beef rest in the hot gravy for 5 to 10 minutes before serving to allow the flavors to settle and the gravy to cling to the meat. Serve warm straight from the glass casserole dish, spooning the tender beef and onion gravy over your choice of potatoes, noodles, or bread.

For a little extra richness, you can tuck a tablespoon or two of cold butter into the hot gravy after baking and stir until melted, though my grandmother always insisted the three main gravy ingredients stay the same: beef, French onion soup, and dry onion mix. If you prefer a slightly thicker gravy, remove the beef to a plate at the end, simmer the gravy in a saucepan on the stove for a few minutes to reduce, then return the beef to the casserole and spoon the thicker gravy over the top. For a deeper, roastier flavor, brown the beef chunks in a hot skillet before placing them in the glass dish; this adds a bit of crust and color but does add an extra step. You can also add sliced fresh onions around the beef before baking if you enjoy extra onion texture, but the base recipe doesn’t require them. If you need to stretch the meal, stir in a can of drained mushrooms or serve the beef over rice instead of potatoes. Leftovers reheat beautifully; the flavors deepen overnight, making wonderful hot beef sandwiches the next day.