This is a really simple recipe that was inspired by reading Harold McGee's article in the NY Times. While I had been planning to make toffee for a while, using the microwave came into my consciousness only after reading McGee. The only caveat here is to use microwave on low power in the later stages - and to check the temperature of the syrup on a regular basis. I used hazelnuts here, but any chopped nuts (almonds, walnuts, pecans) will work as well.