Use a large sheet of foil to form a nest around your beets, then toss with some olive oil and a healthy pinch of kosher salt and pepper. Seal in foil and roast in the top third of the oven until the beets are fork-tender, 45 minutes.
Carefully unwrap the beets and let cool, then slice into quarters. Add the beets, ricotta, vinegar, a large pinch of kosher salt and several grinds of fresh pepper to a food processor. Blend until smooth, then taste, adding more salt and pepper if needed. Pour into a serving bowl and drizzle with olive oil, a few cracks of fresh black pepper and a sprinkle of flaky salt. Serve with the vegetables.