Coat a 12-by-17-inch
rimmed baking sheet with
cooking spray. Bring sugar
and corn syrup to a boil in a
medium saucepan, stirring
and brushing down sides with
a wet pastry brush to prevent
sugar crystals from forming,
until sugar dissolves. Cook,
swirling occasionally, until
mixture just starts to turn golden
around edge.
Stir in mix-ins. Cook, stirring
occasionally, until mixture
is pale amber, about
8 minutes. Pour onto baking
sheet without spreading.
Let cool. Break into pieces.
Brittle can be stored in an airtight container at room temperature for up to 1 week.
I used orange zest instead of lemon, and it was delicious!