English Walnut Toffee ~ there's nothing quite like making your own candy, and this crisp nutty English toffee is one of the best things I've ever eaten ~ make it for friends and family, but definitely make extra to squirrel away for yourself!
Line a square 9x9 baking pan with foil, leaving the ends overlapping the edges so you can lift the toffee out when it has set for easier cutting.
Put the butter, sugar, corn syrup and water in a heavy saucepan. Bring to a boil over medium heat, stirring constantly to dissolve the sugar.
Gently boil the mixture, stirring constantly, until it darkens in color and reaches 300F on a candy thermometer.
Remove from the heat and stir in the chopped walnuts. Pour the hot candy into the prepared pan, smoothing out with a spatula. Be very careful as this is very hot.
Scatter the chocolate chips evenly across the surface of the toffee and let sit for a couple of minutes to let the chocolate melt. Spread the chocolate out evenly with a spreader. Then top with chopped nuts, pressing them in gently so they will stick to the chocolate.
Let cool until set, either at room temperature, or in the refrigerator.