Leeks aren't an ingredient I use much at all myself, probably because I don't see them in my rural grocery store. When I shop bigger stores or farmers markets where leeks might be available, I'll keep an eye out. Particularly in autumn because leeks pair so well with many fall-inspired recipes.
When writing about specific fruits and veggies, I like to look at recipes with that food. I know how I'd use eggplant, but how do others use it? It seems like eggplant pairs endlessly with so many flavors across so many cultures. While eggplant can be the center of the dish, it can also compliment other ingredients. It's definitely worth adding to your next recipe!