Blackberry Marshmallows

Why You’ll Love This Recipe

These marshmallows are a fun twist on the classic, combining sweet blackberry compote with the signature light and pillowy texture of marshmallows. The vibrant purple hue and homemade charm make them perfect for gifting, snacking, or jazzing up s’mores.

Ingredients

For the compote

• 1 cup fresh blackberries, halved
• 2 tablespoons granulated sugar
• 1 tablespoon lemon juice

For the marshmallows

• 1 cup cold water, divided
• 3 envelopes unflavored gelatin (about 7½ teaspoons)
• 1½ cups granulated sugar
• 1 cup light corn syrup
• ¼ teaspoon kosher salt
• 2 teaspoons vanilla extract
• ¼ cup powdered sugar (optional)

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

Directions

1. In a saucepan over medium heat, combine the blackberries, sugar, and lemon juice. Stir until the sugar dissolves, then bring to a boil. Reduce heat and simmer for about 10 minutes, mashing the berries as they soften.
2. Transfer the compote to a bowl and chill in the refrigerator for at least 30 minutes enough to cool completely.
3. Grease a 9×9-inch baking pan and set aside.
4. In the bowl of a stand mixer, combine the chilled compote with ½ cup of cold water. Sprinkle the gelatin on top and let it bloom (absorb moisture).
5. In a saucepan over medium-high heat, mix the granulated sugar, corn syrup, salt, and the remaining ½ cup of water. Stir until the sugar dissolves, then bring to a boil, reaching 240°F (soft-ball stage) on a candy thermometer (approximately 10–12 minutes).
6. With the mixer running on low speed, slowly and carefully pour the hot syrup into the gelatin mixture. Add vanilla extract.
7. Increase mixer speed to high and whip until the mixture is stiff and pale purple about 8–10 minutes. It should form stiff peaks.
8. Pour quickly into the prepared pan, smoothing the top with a spatula. Let set at room temperature for at least 4 hours (or refrigerate for about 2 hours).
9. Once firm, dust with powdered sugar (if using), slice into squares, and coat each piece to prevent sticking.

Servings and timing

• Yields: Around 16 marshmallows
• Prep time: ~10 minutes for compote and mixing
• Cook time: ~10–12 minutes for syrup
• Whip & set time: 8–10 minutes whipping + at least 4 hours setting

Storage/Reheating

Store your marshmallows in an airtight container at room temperature. Use parchment or wax paper between layers to prevent sticking. They’ll stay fresh for several weeks if stored properly.

FAQs

What if I don’t have a candy thermometer can I still make these?

A candy thermometer ensures you reach the soft-ball stage (about 240°F). Without it, achieving the right texture may be difficult and inconsistent.

Do I really need a stand mixer?

Yes whipping the marshmallow mixture takes 8–10 minutes at high speed, which is quite strenuous for a handheld mixer. A stand mixer is strongly recommended.

Can I use frozen blackberries?

Yes, just thaw and drain them first. They’ll work nicely in place of fresh ones.

I don’t have light corn syrup is there a substitute?

Not easily. Corn syrup helps prevent sugar crystallization and contributes to the correct texture.

Why must the compote be completely chilled?

Hot or warm compote can melt the gelatin prematurely and interfere with proper setting.

What’s the role of powdered sugar at the end?

It prevents the marshmallows from sticking together and makes handling easier. It also adds a classic finishing touch.

Can these be roasted or used in s’mores?

Absolutely like standard marshmallows, they’re great for roasting or adding to s’mores.

Can this recipe be made vegan?

Yes use a plant-based gelling agent such as agar-agar instead of gelatin, and follow techniques for firm, set marshmallows.

Why did my marshmallows fail to set?

Possible reasons include: under-whipping, incorrect syrup temperature, or warm compote or gelatin mixture.

Conclusion

These Blackberry Marshmallows are a luscious and fluffy treat that elevate the humble marshmallow with bright berry flavor and homemade flair. With just a bit of careful timing and technique, you’ll create something special perfect for snacking, gifting, or taking your s’mores to the next level. Enjoy the process and the delicious outcome!

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