Roast Grapes: Preheat oven to 425°F (220°C). Arrange washed and dried red grapes on a rimmed baking sheet. Drizzle with 2 tablespoons olive oil and hot honey, scatter thyme sprigs, and season with kosher salt. Roast for 10 to 12 minutes until grape skins blister, wrinkle, and release glossy juices.
Whip Ricotta: In a food processor, blend drained whole milk ricotta, 2 tablespoons olive oil, lemon juice, lemon zest, grated garlic, salt, and black pepper on high for 90 seconds until silky smooth and airy.
Toast Crostini: Slice baguette diagonally into 1/2-inch rounds. Brush lightly with olive oil and toast on a baking sheet at 400°F for 6 to 8 minutes until golden and crisp.
Swirl Dip Base: Spread whipped ricotta across a shallow serving bowl, using the back of a spoon to create swooshes and a deep well in the center.
Top with Warm Grapes: Spoon hot blistered grapes and all of their warm pan juices into the center of the whipped ricotta.
Garnish & Serve: Scatter toasted pine nuts, fresh thyme leaves, and flaky Maldon sea salt over the top. Serve immediately warm with toasted crostini.