Okay little one, a Lenten supper is a special meal that people eat during a time called Lent. Lent is a time when some Christians like to give up some things they enjoy or do extra special things like praying more often. One of the things people usually give up during Lent is meat.
So, a Lenten supper is a meal where people eat foods that don't have any meat in them, like fish, vegetables or pasta. It's kind of like a special dinner party where everyone eats together and enjoys a nice meal. Some people have a Lenten supper every Friday during Lent because that's when they remember that Jesus died on the cross on a Friday.
It's a time to share good food, be with your family and friends, and think about the sacrifices we make during Lent. So, if you're ever invited to a Lenten supper, you know you'll be having a special meal without any meat. Yum!