Honeycomb Sponge Candy (Easy Crunchy Toffee Recipe)

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This honeycomb sponge candy is light, crunchy, and irresistibly sweet with a signature airy texture. Also known as sponge candy, seafoam candy, or cinder toffee, this classic treat is made with just a few simple ingredients and transforms into a crisp, bubbly candy in minutes.

Perfect for snacking, gifting, or dipping in chocolate, this easy honeycomb candy recipe is a fun and impressive homemade treat.

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Prep Time 15

Cook Time 15

Chill Time 2

Total Time 2 30

Ingredients Method Notes

Ingredients

1 ¾ cup granulated white sugar or brown sugar
½ cup golden syrup or honey
1/2 cup water
1 tbsp baking soda

Method

Line a 9 inch square pan with parchment paper (sides and bottom). Have a spatula ready.
Place the sugar, golden syrup / honey and water in a large saucepan (this mixture will expand a lot, so use a large pot with enough space).
Bring the mixture to a boil over medium heat until it reaches 300°F. Do not stir, just mix to make sure the sugar has been dissolved.
Brush the sides of the pot with a pastry brush dipped in cold water to dissolve the sugar crystals on the side of the pot. Do NOT stir the sugar syrup.
When the sugar syrup reaches 300°F, remove it from the heat and immediately add the baking soda.
Whisk briefly until the honeycomb mixture has expanded. Add to your 9x9 pan.
Do not touch it or spread it out, just allow the it to harden. It will take a couple of hours.
Once the candy is ready, remove it from the pan and break it up into chunks.

Notes

❤️ Why You’ll Love This Honeycomb Candy

Light, airy, and crunchy texture
Made with simple pantry ingredients
Fun science-based recipe (it foams instantly!)
Perfect for gifting or holidays
Delicious plain or dipped in chocolate

Tried this recipe?

Let us know how it was!

🔥 Tips for the Best Sponge Candy

Use a candy thermometer for accuracy
Do NOT stir once boiling starts (prevents crystallization)
Work quickly after adding baking soda
Don’t spread the mixture—this keeps the airy texture
Store in an airtight container to prevent stickiness

🍫 Optional Chocolate Coating

For an extra treat:

Melt chocolate
Dip or drizzle over candy pieces
Let set before serving

👉 Chocolate helps balance the sweetness and adds richness.

🍽️ What Is Honeycomb Sponge Candy?

Honeycomb candy is a type of aerated toffee made by adding baking soda to hot sugar syrup, creating bubbles that harden into a crunchy, airy structure.

🌟 Variations

Chocolate-covered: Dip in dark or milk chocolate
Salted version: Sprinkle with flaky sea salt
Honey flavor: Use real honey instead of corn syrup
Thicker candy: Use a smaller pan

🧊 Storage Tips

Room Temperature:
Store in an airtight container for up to 1–2 weeks

👉 Avoid humidity—this candy can become sticky quickly

❓ Frequently Asked Questions

Why didn’t my candy foam up?
The baking soda may not have been fresh or mixed quickly enough.

Why is my candy sticky?
Humidity or improper storage can cause this.

Do I need a thermometer?
Highly recommended—temperature is key for proper texture.

Is sponge candy the same as honeycomb candy?
Yes! They are different names for the same treat.

🍬 Why This Recipe Works

This recipe works because the sugar is cooked to the hard crack stage, and the baking soda creates carbon dioxide bubbles that get trapped as the candy hardens—forming that signature sponge-like texture.

💬 Final Thoughts

This easy honeycomb sponge candy recipe is a fun, classic treat that’s simple to make and incredibly satisfying. With its crunchy texture and sweet flavor, it’s perfect for holidays, gifts, or just a homemade candy craving.

Honeycomb Sponge Candy