Combine the ingredients in a small pan and cook on the stove, mixing until the temperature reaches 150 C. Keep mixing the entire time to prevent separation.
Pour the toffee into the pan and set in the freezer. Smash with a rolling pin.
Make miso toffee by adding 1 tbsp of glucose syrup to the saucepan before heating, and 1 tbsp of red miso paste to the toffee after turning off the stove, mixing well before pouring into the tray. The glucose syrup will help stabilise the toffee so it won’t melt in the oven when baked into cookies.
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Pour onto a tray and cool in the freezerBreak up the toffee with a rolling pin