01 -
Cover the bottom and sides of an 8-inch square tin with baking paper.
02 -
In a small pot, mix condensed milk, lemon extract, and food coloring (optional) together.
03 -
On medium-low heat, stir the chocolate into the mixture until it's completely melted and creamy.
04 -
Taste it, and add extra lemon extract if needed. Stir in zest if using.
05 -
Pour it into the lined tin, toss on some sprinkles if you'd like, and tap the tin gently. Refrigerate at least 4 hours, or overnight.
06 -
Slice it into squares once it's set and firm.