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Grease a cookie sheet and set aside.
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In a heavy pot, add butter, sugar, corn syrup, and water. Heat butter mixture on medium to medium-low heat, stirring until butter is melted. Continue stirring as it comes to a boil. Make sure to scrape sides and bottom of entire pan while stirring constantly until mixture reaches 300 degrees on the candy thermometer.
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Once toffee mixture reaches 300 degrees and is thick and golden, remove from heat and continue to stir a few more times. Immediately dump onto the greased cookie sheet and spread out evenly. Pour chocolate chips evenly over toffee and let sit a few minutes until melty.
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Using a butter knife or rubber spatula, spread chocolate over toffee. Sprinkle with almonds. Place in the fridge until the chocolate is completely set. To serve, lift corners to begin to break toffee into pieces, and repeat for entire pan.
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Yields about 3 lbs of toffee.