Bonfire toffee (also known as treacle toffee, Plot toffee, or Tom Trot) is a hard, brittle toffee associated with Halloween and Guy Fawkes Night (also known as "Bonfire Night") in the United Kingdom. The toffee tastes very strongly of molasses (black treacle), and cheap versions can be quite bitter. In Scotland, the treat is known as claggum, with less sweet versions known as clack. In Wales, it is known as loshin du. (losin du or taffi triog).