Remove the lid or foil, then use two forks to gently shred the roast right in the casserole dish, pulling it into large, tender chunks. Stir the meat into the gravy so every piece is coated in the rich brown sauce.
Taste the gravy and add a pinch of salt and pepper only if needed (the soup and onion mix are already seasoned). Serve the shredded pot roast hot, spooning plenty of the brown gravy over each portion.
For a milder flavor, use a low-sodium onion soup mix and a low-sodium cream of mushroom soup; you can always add a little salt at the table. If your family isn’t big on mushroom pieces, choose a “cream of mushroom” soup that’s blended smooth or strain out larger bits before adding it to the roast. For kids who prefer slices instead of shreds, cook the roast just until it’s very tender but still holds together, then cut it into thick slices and spoon the gravy over the top. If you like a slightly thicker gravy, remove the roast to a plate after cooking, place the casserole dish on a low burner, and simmer the gravy for a few minutes, stirring often, until it thickens to your liking (you can also whisk in 1 teaspoon of cornstarch mixed with 1 tablespoon of cold water). To stretch the meal for a bigger crowd, serve the shredded beef on toasted buns as open-faced sandwiches with the gravy spooned over, or pile it onto buttered egg noodles for a hearty one-dish supper. Leftovers reheat well; store them in the gravy in an airtight container in the fridge for up to 3 days or freeze for a quick future dinner.