These addictive sweets require only 3 ingredients and take under 10 minutes to make.
Melt the butter on low heat. Add the chopped walnuts and stir until they are well coated. Then add the sugar.
Once the sugar is added, raise the heat to medium and stir frequently for 5 minutes with a heat-resistant spatula. For the first 2 1/2 minutes or so, the sugar will soften but remain visible in granules. After that, it begins to soften and liquify. Once it begins to soften, keep moving the walnuts around. If necessary, lower the light to keep the sugar from burning.
Immediately after the 5 minutes of cooking, pour the walnuts onto a parchment-lined pan or baking sheet in a single layer. They will cool down in less than 5 minutes. Try to separate the walnuts while they are still hot. As they cool, they will crisp up and if any remain attached, you can break them apart.