Preheat oven to 400°F (200°C).
Toss the carrots with olive oil, salt, and pepper on a parchment-lined baking sheet.
Roast carrots for 25 to 30 minutes, turning halfway through, until tender and caramelized.
While carrots roast, place ricotta, lemon zest, and lemon juice in a food processor.
Process ricotta mixture for 1 to 2 minutes until smooth and light.
Spread the whipped ricotta on a large serving platter.
Arrange the warm roasted carrots on top of the ricotta bed.
Drizzle the entire dish with hot honey.
Garnish with fresh thyme leaves and crushed pistachios before serving.