Question 1157225
Try {{{ y^2 = 4a*x }}}
The focus will be on the x-axis a units from the origin.
here's the plot with {{{ a = 5 }}}:
 {{{ graph( 500, 500, -12, 12, -12, 12, sqrt( 20x ), -sqrt( 20x )) }}} 
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A vertical line through the focus intersects the parabola at
( a, 4a/2 ) and ( a, -4a/2 ), and with {{{ a = 5 }}}
( 5, 10 ) and ( 5, -10 )
You can use {{{ a }}} to adjust diameter of the ( rotated ) parabola 
which is the cooker.
Note that solving for {{{ y }}},
{{{ y = sqrt( 4a*x ) }}} and
{{{ y = -sqrt( 4a*x ) }}}
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hope this helps