You could also toast them in a skillet over medium heat as well. Using your heavy saucepan combine the butter, sugar, and water and place it over medium heat. Stir the butter toffee constantly with a rubber spatula until the mixture begins to boil, about 5 minutes.
Line a 8x 8 or 9x13 inch pan with foil. In a medium heavy-duty saucepan over medium heat, combine your sweetener and butter and stir until your sweetener is dissolved. Bring to a boil and cook without stirring until the mixture darkens to a deep amber color (about 5 - 7 minutes)
In the US "low carb English toffee" is basically a buttercrunch that's topped with chocolate and nuts - it's a popular holiday candy. You only need 6 ingredients to make this easy low carb toffee recipe: Butter: The main ingredient. It should be unsalted. Allulose: I chose allulose as my sugar free sweetener.
You get cute little circles that way and don't need to flip the toffee over or cut it. That method can also help with portion control. This basic combination of cream, butter, and sweetener can be used to make all varieties of keto toffee. Nuts: Any type of nuts work!