Step 1

Line a 15 X 10-inch baking sheet with parchment paper and coat lightly with nonstick spray, or alternately you can use a silicone mat. Also coat an off-set spatula with nonstick spray for easy spreading. Set aside.

Step 2

Combine syrup, sugar, water and butter in a heavy 3-quart saucepan over medium heat. Stir frequently, until the sugar dissolves and the mixture comes to a boil.

Step 3

Once boiling, continue to cook without stirring until temperature reaches 280°F on a candy thermometer.

Step 4

Gradually stir in peanuts, stirring until temperature reaches 300°F. Remove the pan from the heat and stir in the baking soda. Mixture will foam slightly and become lighter in color.

Step 5

Immediately pour the mixture onto the prepared cookie sheet. With the off-set spatula, spread the mixture evenly to edges. Sprinkle with flaked sea salt, if desired.

Step 6

Cool and break into pieces.