Chew and Eat

People buy me to eat but never eat me.

What I am?

I am made of milk. You keep me in the fridge.

I am cold and you like to eat me in the summer.

Who am I?

It is purple. It is Long.

It is a softer vegetable. It grows from a plant.

What is it?

What has to be broken before you can use it?

It is Orange. It is big and thick.

It is a popular vegetable in autumn and spring. 

You can carve it in Halloween.

What is it?