In a cold bowl (the colder the better), whip cream, powdered sugar and vanilla together to form stiff peaks. Refrigerate.
Bring berries and teaspoon of sugar to a boil over medium heat. Whisk to dissolve sugar. Cook to soften berries to a pulp. Cool. Run pulp through a sieve to remove seeds if desired.
Set an empty bowl over a bowl of hot water. Mix gelatin with the 1 tablespoon of strained pulp juice over the hot water to dissolve. Add to the pulp. Mix.
Fold whipped cream into pulp.
Top portions with berries if desired.