My grandmother fed her whole family with this forgotten depression era recipe. It sounds strange but the flavor is absolutely incredible.

This slow cooker 4-ingredient poor man’s potato and canned mackerel is my modern take on the kind of dish my grandmother leaned on during the Depression era. It’s built from humble pantry staples—potatoes, canned fish, a bit of onion, and milk or broth—stretched into something deeply comforting and surprisingly flavorful. Long, gentle cooking turns the potatoes silky and the mackerel flaky, creating a light, creamy broth that tastes far richer than the ingredient list suggests. It’s the kind of recipe you make when the fridge looks bare, but you still want to put a hot, filling meal on the table for a crowd.

Serve this straight from the slow cooker with plenty of black pepper and a sprinkle of salt at the table. It’s lovely ladled into shallow bowls with crusty bread, toast, or simple buttered rolls to soak up the creamy broth. A bright side salad—think vinegar-dressed cabbage or a basic green salad—adds a bit of crunch and acidity that balances the richness of the potatoes and fish. If you want to lean into the old-fashioned comfort angle, serve with sliced pickles or pickled beets on the side and a cup of hot tea or coffee.

Servings: 4

2 pounds russet or Yukon Gold potatoes, peeled and cut into 1-inch chunks

Lightly grease the inside of a 4- to 6-quart slow cooker with a bit of oil or butter to help prevent sticking and make cleanup easier.

Layer the sliced onion evenly over the bottom of the slow cooker. This acts as a flavorful base and keeps the potatoes from sticking directly to the surface.

Add the potato chunks on top of the onions, spreading them into an even layer so they cook uniformly and soften at the same rate.

Gently flake the drained canned mackerel into bite-size pieces with a fork, removing any large bones if desired (the soft bones are edible, but you can pick out bigger ones for a smoother texture). Scatter the fish evenly over the potatoes.

Pour the milk or chicken broth over the potatoes and mackerel, nudging the ingredients lightly with a spoon so the liquid seeps down and just barely covers most of the potatoes. Do not stir aggressively; you want distinct flakes of fish and pieces of potato to remain intact.

Cover the slow cooker with the lid and cook on LOW for 6 to 7 hours, or on HIGH for 3 to 4 hours, until the potatoes are very tender and starting to break down around the edges and the mackerel is flaky and well warmed through.

Once cooked, use a large spoon to gently stir from the edges toward the center, just enough to combine the onions, potatoes, and mackerel into a rustic, creamy mixture. The potatoes should release some starch into the liquid, creating a light, chowder-like broth with visible chunks of fish and potato.

Taste and season with salt and freshly ground black pepper if you like, keeping in mind that canned mackerel and some broths can already be fairly salty. Ladle into bowls and serve hot directly from the slow cooker.

To stay close to the spirit of a Depression-era dish, this recipe keeps the ingredient list short, but you can adapt it to what you have on hand. For a slightly richer, more chowder-like texture, use 2 cups whole milk and 1 cup water or broth instead of all milk; the starch from the potatoes will naturally thicken it. If you prefer a lighter dish, use all broth and skip the dairy. You can also swap the onion for 2 leeks (white and light green parts only) if you want a softer, sweeter flavor, or add 1 to 2 cloves of minced garlic for extra aroma without changing the basic concept. Other canned fish, such as sardines or tuna, can stand in for mackerel, though mackerel’s firm texture holds up especially well to long cooking. For more vegetables, stir in a handful of frozen peas or shredded cabbage during the last 30 minutes of cooking so they stay bright and not overdone. Food safety tips: Always check the expiration date and condition of canned mackerel before using; discard any cans that are bulging, rusted through, or have a strong off smell once opened. If you use milk, keep the slow cooker covered and avoid cooking on the WARM setting only—use LOW or HIGH as directed so the dish passes through the temperature danger zone (40°F to 140°F) quickly. Once cooked, do not leave the slow cooker on the counter for more than 2 hours; refrigerate leftovers in shallow containers and use within 2 to 3 days, reheating gently on the stovetop or in the microwave until steaming hot. If you are sensitive to bones, take a moment to feel through the mackerel before adding it to the slow cooker and remove any larger bones, even though the small, soft bones are generally safe and edible.