The toffee is quick and easy to make, I usually have all ingredients on hand, and it will be eaten quickly. This is all that's left of the batch I made yesterday for a gathering:
1 cup sugar
½ cup butter (1 stick), cut into 4 to 8 chunks
¼ cup water
½ teaspoon salt
1 cup sliced almonds, divided in half
6 oz chocolate: chips, chopped or melted
Prepare a cookie sheet with parchment paper, silicone pad, plastic-coated freezer paper (which I use), or grease it if you have no other option.
In a saucepan put the sugar, butter, water and salt. Under high heat, cook without stirring until it reaches 285° F. Take off heat, and immediately stir in ½ cup almonds.
Sprinkle chocolate chips or chopped chocolate on top of toffee. Wait about a minute to allow chocolate to melt on the hot toffee, then spread (if you don't have chocolate chips, and you want to avoid chopping bars or chunks of chocolate, just melt in the microwave and spread on top).
Sprinkle the remaining ½ cup almonds on top and use a spatula to press into the still melted chocolate.
When cold and hard, break into pieces. If you need it to harden quickly (which I usually find I do since I wait too long make it before leaving for a party), let cool about 10 to 15 minutes, then place the cookie sheet in the freezer another 10 to 15 minutes.