Notes: Use a plain sweet Muscat wine such as Bonny Doon Vineyard's Vin de Glacière, or an Orange Muscat wine such as Quady Winery's Essensia.
In a 2- to 3-quart pan, mix grape juice, gelatin, and sugar. Stir over medium heat until gelatin and sugar are dissolved, 3 to 4 minutes.
Remove from heat and add wine. Nest pan in a bowl of ice water and stir often until mixture is cold and mounds slightly on a spoon, about 20 minutes.
Remove pan from ice water and stir in strawberries and blueberries.
Spoon mixture equally into 1- to 1 1/2-cup wineglasses. Chill airtight until gelatin mixture is firm to touch, at least 1 hour or up to 1 day.
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