Cooking project for 14- and 15-year-old boys

My friend is a single mom with 14-and 15-year-old sons. She loves to cook; I love to cook; I know the boys love to eat. I'd like to organize a cooking afternoon for all of us, but I'm not sure what would capture their interest and/or teach them something.

Not knowing their level of kitchen skills, I thought I'd get your thoughts before I approach mom. A pot of soup might be boring, but several dozen pot stickers might be too tedious (although I have a cheap plastic pirogi press that I'm not ashamed to use!)

What might be a couple of things I could suggest to mom? I don't want to deep fry nor make sushi. The kids are heavily into meat, grilled steaks. I would like to introduce them to more vegetables.

Mac and cheese is too predictable. Maybe stir-fry or spring rolls?

Any thoughts appreciated. Thanks.