I am not sure how old your kids are, but if they are old enough to cook a simple meal, you could ask them each to prepare dinner one night a week. You can shop for the food and have it ready for them to prepare, but let them come up with an idea of what they would like to have.
I tried this approach when my kids were in their teens, not just to get them to the table but to help them appreciate what I do, and also to help them to be self sufficient in the kitchen.
Anyway, it may inspire them to want to sit down together and share the meal they just prepared. Just a thought.