Every spring, right about the time the local market stacked those big bags of sweet onions by the door, my mother would pull out her old slow cooker and make this simple, caramelized macaroni supper. Money was tight and sales mattered, but she could always turn three humble ingredients into something that tasted slow and buttery and special. The onions melt down into a deep, golden tangle that coats every elbow of pasta, and the butter ties it all together into a sweet, comforting bowl that feels like home after a long day in the fields or at work.
This slow cooker sweet onion macaroni is rich and buttery, so I like to keep the sides simple: a crisp green salad with a tangy vinaigrette or a plate of sliced fresh tomatoes with a sprinkle of salt and pepper to cut through the sweetness. It also sits nicely alongside baked ham, grilled pork chops, or a roasted chicken if you want to stretch it into a bigger meal. A dish of tart applesauce or pickled beets on the table brings that old-fashioned Midwestern balance of sweet and sour that makes everything taste just a little more complete.
Slow Cooker Sweet Onion MacaroniServings: 4
Ingredients
2 pounds sweet onions (such as Vidalia), peeled and thinly sliced
1 cup (2 sticks) unsalted butter, cut into chunks
12 ounces dry elbow macaroni
Directions
Lightly grease the inside of a medium slow cooker (about 4 to 5 quarts) with a small dab of the butter to help prevent sticking.
Scatter the sliced sweet onions evenly in the bottom of the slow cooker. Dot the onions with the butter chunks, tucking some down into the onions so they melt and coat everything.
Cover and cook the onions and butter on HIGH for 2 to 3 hours, stirring once or twice if you are nearby, until the onions are deeply golden, very soft, and starting to caramelize around the edges. They should look glossy and smell sweet and nutty. If they are browning too quickly on the edges, turn the slow cooker down to LOW.
Once the onions are well caramelized and swimming in buttery juices, stir them thoroughly, scraping up any browned bits from the sides of the crock so they mix back into the onions.
Add the dry elbow macaroni directly to the slow cooker, sprinkling it over the top of the onions. Stir well to coat every piece of pasta in the buttery onion mixture, making sure to work the onions up from the bottom so they are evenly distributed throughout.
Pour in just enough hot tap water to barely cover the pasta and onions, usually about 3 to 3 1/2 cups, stirring as you go so everything is moistened. The mixture should be loose but not soupy, with the pasta submerged. (If needed, press the pasta down gently with the back of a spoon.)
Cover the slow cooker again and cook on HIGH for 45 minutes to 1 1/2 hours, stirring every 20 minutes or so, until the macaroni is plump, tender, and has absorbed most of the buttery onion liquid. Each time you stir, check the bottom for sticking and add a splash of hot water if the mixture looks dry before the pasta is fully cooked.
When the macaroni is just tender and coated in a glossy butter and onion sauce, taste and adjust the texture. If it seems too tight, stir in a spoonful or two of hot water to loosen; if it is too loose, let it cook uncovered for another 5 to 10 minutes, stirring once, until it thickens slightly.
Turn off the slow cooker and let the macaroni rest, covered, for 5 to 10 minutes. This short rest helps the sauce settle into a silky coating instead of soaking in too much and drying out.
Give everything a final gentle stir to bring the caramelized onions up through the pasta, then serve warm straight from the slow cooker, making sure each spoonful has plenty of golden onion pieces mixed with the macaroni.
Variations & Tips
Because this recipe leans on just three ingredients, each one matters. Choose good, heavy sweet onions (Vidalia, Walla Walla, or similar) and take your time with the caramelizing step; that is where the deep sweetness comes from. If you prefer a little savoriness to balance the sweetness, you can sprinkle a small pinch of salt and black pepper over your own serving at the table without changing the core three-ingredient nature of the dish. For a slightly richer texture, stir in a spoonful of reserved onion butter from the bottom of the slow cooker just before serving, or top individual bowls with a pat of butter to melt over the hot macaroni. If your slow cooker runs hot, keep an eye on the onions during the first phase so they brown slowly instead of burning; stirring once or twice makes a big difference. For a firmer pasta, check for doneness early and stop cooking when the macaroni is just tender, since it will continue to soften a bit as it rests. Leftovers should be cooled promptly and stored in a covered container in the refrigerator for up to 3 days; reheat gently on the stovetop or in the microwave with a splash of water to loosen. Do not leave cooked macaroni sitting in the slow cooker on the warm setting for more than 2 hours, as that can encourage bacterial growth and make the pasta mushy. If you want to stretch the recipe to feed more people without changing the spirit of it, you can serve smaller scoops alongside a protein and a couple of simple vegetables, letting the sweet, buttery onions be the star of the plate.
