If you are vegetarian, what is your favourite, essential vegetable?

I recently went vegetarian based on cholesterol and heart. I'm enjoying it. Not missing meat, eggs, butter in the least.

I discovered onions are essential. They are the basis of every meal
And in salads

In addition I really like rocket / arugula
jalapenos, kale
Chili tomato sauce by Barilla preferably
If you are vegetarian, what is your favourite, essential vegetable?
Post Opinion