LW's options include cooking classes, prepackaged food delivery services like Blue Apron or Dinnerly, or just watching simpler YouTube videos on how to cook. I'd recommend YouTube to get them through scrambled eggs, easy homemade pasta sauces, and soups/stews. The delivery services are better when you have a decent cooking baseline to work with.

And yes, the gendered assumption has to go. There's the sexism, and there's also the basic reality that sooner or later everyone needs to be able to feed themselves.