Grease a large, rimmed baking sheet very well with butter. Set aside.
In a large, heavy-bottom saucepan combine the butter and sugar over medium heat. Bring to a boil, stirring constantly.
Carefully stir in the water, light corn syrup, and salt. Cook over medium heat, stirring constantly until it reaches 285˚F-290˚F.
Remove from heat. Stir in the chopped almonds and pour onto the prepared baking sheet. Allow to cool.
Melt the chocolate chips and spread evenly over the toffee.
Sprinkle with the finely chopped almonds.
Allow the chocolate to harden and then cut the toffee into bite-sized pieces. Store in an airtight container for up to 2 weeks.
Video
Notes
Safety:The toffee mixture is extremely hot, so be extra careful! It is helpful to have another person available to help while pouring the hot candy mixture onto the baking sheets.Storage:Store toffee in an airtight container at room temperature for up to two weeks.