First Step: Prepare Your Workspace and Equipment
Line a 9-inch square baking pan with parchment paper for a thick honeycomb or a half-sheet pan for a thinner variation. Gather all utensils including a large (at least 5-quart) heavy-bottomed pot, candy thermometer, whisk, and heat-proof spatula. Measure out all ingredients precisely before starting to avoid disruptions, especially before introducing baking soda.

Second Step: Combine and Heat the Syrup Mixture
In the pot, combine granulated sugar, golden syrup or honey, water, and salt. Stir gently just to dissolve sugar before heating. Begin heating on medium, avoiding stirring once the mixture reaches a boil to prevent unwanted crystallization. Instead, swirl the pot carefully to mix. Brush down sides periodically with cold water to minimize sugar crystals.

Third Step: Boil to Hard Crack Stage
Attach a candy thermometer and cook the syrup until it reaches 300°F (150°C), the hard crack stage necessary for proper honeycomb texture. Monitor the temperature closely and remove from heat immediately upon reaching this point to avoid burning or bitterness.

Fourth Step: Whisk in Baking Soda and Optional Gelatin
Once off the heat, quickly whisk in sifted baking soda. The mixture will foam, rising rapidly and expanding in volume. For a denser sponge candy effect, bloom gelatin in 2 teaspoons of warm water before dissolving gently, then add it to the syrup just prior to baking soda. Whisk thoroughly to ensure even aeration.

Fifth Step: Pour and Set the Sponge Candy Honeycomb Candy
Immediately pour the foaming syrup into the prepared pan. Allow it to cool and harden undisturbed for at least one hour or several hours for optimal texture. Avoid touching or moving the pan during this time, which could disrupt the honeycomb’s airy structure.

Final Step: Break, Coat, and Serve
When fully set, remove the candy from the pan using the parchment paper edges. Break it into shards or bite-sized pieces using a sharp knife or by hand. For a polished finish, temper your chocolate and either dip or brush it generously onto the honeycomb pieces. Sprinkle sea salt flakes over the chocolate before it sets to add a touch of savory contrast and prolong freshness. Let the coating set at room temperature before enjoying.