Answer:
Round as an apple, deep as a cup, and all the kings' horses can't fill it up. What is it?
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
I hide but my head is outside.
It's like food but water kills it. What is it?
Each of these ends in a kettle full of precious metal and the double variety is quite awesome
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.