Preheat oven to 425°F. Line a large sheet pan with parchment.
Toss carrots with 2.5 tbsp olive oil, honey, cumin, red pepper, and half the salt and pepper on the pan.
Spread in a single layer. Roast 20–25 minutes, turning once, until tender and caramelized.
Blend ricotta, lemon zest, lemon juice, 1.5 tbsp extra-virgin olive oil, and garlic in a food processor.
Season ricotta with remaining salt and pepper. Process until very smooth and fluffy, 60–90 seconds, then chill briefly.
Spread whipped ricotta on a shallow platter. Pile warm carrots over the center.
Drizzle with 1 tsp olive oil. Sprinkle pistachios, dill, and flaky salt. Serve with toasted bread.