01 - Lightly oil or spray 6 small ramekins or glasses (4–6 oz capacity). Set aside on a flat surface.
02 - Sprinkle gelatin over 2 tbsp cold water in a small bowl. Let stand for 5 minutes until gelatin absorbs the liquid and becomes soft.
03 - Combine cream, milk, sugar, lemon zest, and salt in a saucepan. Heat over medium heat, stirring constantly, until mixture is steaming and sugar is completely dissolved. Do not allow to boil.
04 - Remove saucepan from heat. Add bloomed gelatin and whisk vigorously until fully dissolved and no granules remain visible.
05 - Stir in lemon juice and vanilla extract. Whisk until mixture is completely smooth and uniform in color.
06 - Pour the mixture through a fine mesh sieve into a pitcher or measuring cup to remove lemon zest pieces and any undissolved gelatin.
07 - Divide mixture evenly among prepared ramekins. Let cool to room temperature, then refrigerate for at least 4 hours or overnight until completely set.
08 - Preheat oven to 400°F. Toss 1 cup grapes with olive oil, honey, and thyme. Spread on a parchment-lined baking sheet. Roast for 10–12 minutes until grapes are soft, juicy, and caramelized. Cool completely.
09 - Cut remaining 1 cup grapes in half. Keep refrigerated until ready to serve.
10 - Run a thin knife around edges of ramekins and invert onto plates, or serve directly in glasses. Arrange roasted grapes with their juices on one side and fresh grape halves on the other. Garnish with additional lemon zest or thyme if desired.