According to wikipedia, the common features of comfort food are nostalgia, simplicity, and carbs.
There is a family recipe simply called "Shells" that we ate 2-3 times per month when I was growing up. We don't eat it quite as often in my household now but I just made it last night and it's still great, simple and nostalgic and loaded with carbs, in addition to being a bit of an umami bomb.
At its simplest, it has 4 ingredients. A 1lb box of shell pasta, cooked. 1/2-3/4 lb bacon. An onion, diced fine. A 28oz can of tomatoes. You dice up the bacon and cook it until crisp, pour off most of the fat then sautee the onion in what's left until soft & translucent, add the tomatoes, bring it to a simmer, then once the pasta is cooked and drained you add the bacon and the pasta, stir to combine, and serve.
Last night I altered the blueprint a bit by adding a little minced garlic into the onions a minute or two before adding the tomatoes, and hit the tomatoes with a small splash of balsamic vinegar and an even smaller splash of fish sauce, as if the dish wasn't enough of an umami bomb to begin with. I'm not sure the dish needed it but it didn't hurt it either.
Anyway, I've been curious recently about whether this is commonly known or just a cheap thrown-together thing that ended up being a tradition in my family. I asked my mom this morning, who says there was never any recipe, it's just something her mom used to make as a side dish when they were having hot dogs for dinner. Mom grew up on the south/southwest side though, maybe it was a neighborhood thing? I don't know.
Anybody else ever have this dish growing up? If not, try it out if it sounds good to you. It's cheap, filling, and super tasty, and Mom would get a kick out of knowing that grandma's Shells dish lived on outside the family.