Strawberry Champagne Trifles with Champagne "Caviar"

Bahan-bahan (8 porsi)

• 1 pound strawberries, divided
• 1 bottle rosé champagne, or champagne of choice, divided
• 3 tablespoons cold water
• 2 packets (4 teaspoons) unflavored gelatin
• 1 1/2 cups strawberry jam, divided
• 2 teaspoons granulated sugar
• 2 -3 cups very cold vegetable oil, chilled in the refigerator
• 1 pound (454 grams) mascarpone cheese
• 1 can (397 grams) sweetened condensed milk
• 1 teaspoon vanilla extract
• 3/4 cup heavy cream
• 1 package ladyfinger biscuits, lightly crushed