Consider this your fancy, party-ready congealed salad. The temperature of the prosecco and club soda are key. Keeping the liquids cold helps the salad congeal faster, before too many of the tiny bubbles disappear.
Southernliving.com

Berries and Bubbles
from Southernliving.com
Hands-on: 15 mins
Total: 3 hrs
Yield: Makes 8 to 12 servings
Ingredients
1 (1-oz.) package unflavored gelatin
3 cups chilled prosecco, divided
1 cup sugar
1/2 pt. fresh raspberries
1/2 pt. fresh blackberries
1 cup cold club soda
Directions
1. Sprinkle gelatin over 1 cup cold prosecco in a large bowl. Let stand 3 minutes.
2. Stir together sugar and remaining 2 cups prosecco in a medium saucepan. Bring to a boil over high heat, stirring constantly; boil, stirring constantly, until sugar dissolves. Add hot prosecco to gelatin mixture, and stir until gelatin dissolves. Chill until consistency of unbeaten egg whites (about 40 minutes).
3. Place raspberries and blackberries in a 6-cup gelatin mold. Stir cold club soda into chilled gelatin mixture until blended. Pour over fruit in mold. Chill until set (about 2 hours).
4. If necessary, run a small knife around edge of mold to break seal. Dip bottom of mold in warm tap water for about 15 seconds. Unmold onto a serving plate.
Comments: Woohoo! Happy New Year! We chose to celebrate with this divine prosecco and berry gelatin dessert that gently fizzles in your mouth, while the accompanying fresh fruit and whipped cream add color, sweetness, and texture.
I don’t recommend altering this recipe – with one exception. The amount of prosecco in this jelly creates a strong wine taste, and, if you are serving someone who prefers sweet wine or dislikes the taste of alcohol, they may prefer the ratio of sugar to wine in this previous recipe. Know thy audience, right?
Happy 2022, All! Wishing everyone a joyful and peaceful year in spite of the uncertainty of the times.