Answer:
I start in little but I end in full, you'll find me in half and complete.
What is this Mexican dish consisting of a tortilla rolled around a filling, typically of beans or ground or shredded beef?
No sooner spoken than broken. What is it?
Most people need it, some ask for it, some give it, but almost nobody takes it. What is it?
What do roses, chocolates, laces, love knots, the color red and hearts have in common?
Break me and I am better immediately set and harder to be broken again.