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What kind of mirror – concave, convex or plain would be best suited for use in a solar cooker?

Why?
 
The solar cooker is used to heat and cook food. It uses 
as the
 source.
 
In a solar cooker, a mirror is used to 
and 
the sunlight at 
point.
 
So a 
can be used in a solar cooker, as it concentrates all the sunlight at one point resulting in an
, thereby heating and cooking the food.
Answer variants:
heat
one
concave mirror
wind
electrical
sunlight
decrease in temperature
reflect
convex mirror
focus
increase in temperature