01 -
Cover your 8-inch square pan with wax paper or parchment, then give it a light oil spray.
02 -
Put sugar in food processor and run it for 30 seconds to make it extra fine.
03 -
Mix sugar, milk and butter in your pot and heat until it bubbles on medium-high heat.
04 -
Let it bubble for exactly 5 minutes without touching it - no stirring at all.
05 -
Take pot off heat, add yellow coloring if you want.
06 -
Put in white chocolate and stir until it's completely smooth.
07 -
Mix in your fresh lemon juice and zest right away.
08 -
Pour everything into your pan quickly and smooth the top.
09 -
Leave it alone until it's totally cool and firm before cutting.