onion caramel

To make onion caramel: Line an 8" pan with greased waxed paper or a silicone mat. Place 300g of onion syrup in a 5-qt pot (don't use a smaller pot as the syrup will form large bubbles and expand considerably). Add 200g heavy cream and set the pot over medium-high heat, stirring until mixture begins to boil. Cook to 250F/121C. Immediately pour onto prepared pan and let cool until caramel hardens. Cut into desired sizes and shapes with an oiled knife.