Ingredients
- 1 1/2 cups sugar
- 1/4 cup water
- 1/4 cup corn syrup
- 1/3 cup honey
- 1 tablespoon, plus 1 teaspoon baking soda, sifted
- 1/4 teaspoon cream of tartar
- Pinch of sea salt
Instructions
Before you get started, grease a 10-by-8-inch baking pan (or a similar size), then line with parchment paper so that it covers the bottom and up and over the sides by a few inches to extend the height of the pan walls. Sift the baking soda and cream of tartar into a small bowl. You want to have this ready to go. Using at least a five-quart pot or Dutch oven, add the sugar, water, salt and corn syrup, then place onto the stove over medium-low heat. When the sugar and syrup start to bubble, add the honey.
Using a thermometer, bring this mixture to 300 F.
Once the temperature is reached, remove the pan from the heat and add the baking soda and cream of tartar. Using a heat-proof spatula, begin stirring. The toffee will start to expand rapidly. Quickly incorporate all the baking soda, then pour into the baking pan. The toffee will continue to expand a little then start to sink in the centre.
Let the toffee cool for about 2 hours before removing it from the pan. Once removed, break into small pieces and place into an air-tight container. The sponge toffee will keep for up to a couple of weeks depending on humidity.