5 glass 9-inch Pyrex round pie pans
Candy Thermometer (stay away from the glass ones as they get quite hot)
2 Copper-bottom saucepans or (or similar quality)
Wooden Spoon, Spatula
Butter your Pyrex pans using one of the sticks of butter and set aside (don’t worry, you’ll have a little less than 4 sticks for the recipe after this step, but that’s o.k). Put the chocolate chips in one of your pans and heat on very low heat to get them melting. Once melted, turn heat off and allow them to hang out—you’ll use it to top the toffee later.
Place sticks of butter in saucepan with candy thermometer fitted on side. Heat slowly on low-medium heat and stir constantly until you reach 170 degrees. Slowly dribble the water into the butter, stirring as you go and then bring the temperature back up to 170.
Add the sugar very slowly, stirring in between each addition. Then, simply continue stirring until the mixture reaches a “hard crack” stage of 300 degrees. This should take roughly twenty minutes depending on your stove and cookware. When you reach about 275 degrees, the heat will stay right there for quite sometime. Don’t worry. Keep stirring. If things are going well the mixture should be increasing in volume, about 2x what it looked like originally. Look for the color to be changing to a nice, caramelly brown.
When you reach the “hard crack” stage, pull the pan off and pour into the Pyrex in a circular motion, hitting the center last (this will prevent you from pouring it all into the center of the pan and having it sit in a clump there—you’re going for a nice even layer). Wait about 5 minutes for toffee to cool (you don’t want to melt the wax paper) and then loosen the candy from the Pyrex gently with a knife using a circular motion. Set on wax paper and blot with a napkin to get rid of any extra butter (which would make it difficult for the chocolate layer to stick).
Check on your chocolate and make sure it hasn’t firmed back up (if it has, give it a quick heat on the stove). Spread melted chocolate on the surface with a spoon or spatula and sprinkle nuts generously. Gently press nuts into the chocolate so they’ll stick and flip toffee over. Repeat on other side. Then layer toffee onto a cookie sheet and put in fridge to cool and set completely—24 hrs is ideal.
After completely set, break up into pieces and arrange in tins or plates.