So, for the past ten years or so I've been on a quest to try making it myself. Usually my attempts are failures, even if the candy is still edible. (For example, see here.) However, a couple of years ago someone posted a tutorial which we tried. Apparently it worked that first year, although I don't have a record of it. But I tried it again this year, and have made four successful batches of toffee. I think I can stop looking for a recipe now. And I hope I didn't just jinx myself, because this is what Wayne wants to take to his co-workers this year!
Homemade Almond Roca
1 cup butter
1 rounded cup sugar
2 tablespoons water
1 cup sliced almonds
2/3 cup chocolate chips
3 tablespoons finely chopped almonds
Line a 9x13" pan with foil and butter (or Pam) it. Melt the butter in a thick-bottomed 4-quart saucepan. Add the sugar and water and cook on medium-high until it reaches the toffee stage.** Stir in the sliced almonds and pour into the prepared pan. Sprinkle chocolate chips on top and let sit for a few minutes to melt. Then spread chocolate with a spatula and sprinkle with remaining chopped almonds. Cool until hardened. Remove from pan and break into pieces.
**Isn't that a helpful instruction? Here's where you need to go to the tutorial. It outlines the three stages the candy goes through - runny and buttery, "cheesy", and runny and gold caramel colored.