Both my 1 year old and my 4 year old love cucumber, tomatoes, peas, broccoli, etc, and usually eat it before anything else on the plate.
It feels really weird to have to tell a 4 year old to eat some meat or rice before getting more cucumber, as they also need some calories, but here we are.
It tastes good. I like it. It is favorite vegetable of my kids, who both lived it as little and still eat any amount available of it with dinner or lunch.
They also like salad from it, which they approach almost as a treat.