Step 1

Preheat oven to 375°F (190°C). Fold a 12- by 24-inch sheet of aluminum foil in half to form a square. Crimp two edges to form a pouch. Toss beets, 1 tablespoon (15ml) olive oil, rosemary or thyme sprigs (if using), and salt and pepper to taste in a medium bowl until beets are coated. Add to pouch and crimp remaining edge to seal. (If using multiple colors of beets, roast in separate pouches.) Transfer to a rimmed baking sheet and place in oven. Roast until beets are completely tender and a toothpick or cake tester inserted into a beet through foil meets little to no resistance, about 1 1/2 hours. Remove from oven and allow to cool. When beets are cool enough to handle, peel by gently rubbing skin under cold running water. Cut beets into 1 1/2–inch chunks. Beets can be cooked and stored in the refrigerator for up to 5 days.

Step 2

Place pistachios in a mortar and pound with pestle until lightly crushed but not totally pulverized. (You can also chop them with a knife.) Transfer half of nuts to a large bowl and reserve the rest for garnish.

Step 3

Add grapefruit juice, orange juice, lemon juice, shallot, minced herbs, and honey to bowl with pistachios and whisk to combine. Drizzle in remaining 3 tablespoons (45ml) olive oil while whisking constantly. Season to taste with salt and pepper.

Step 4

To Serve: Toss beets and citrus with vinaigrette in a large bowl (if using red beets, toss them separately from everything else) and season to taste with salt and pepper. Spread half of ricotta over a serving platter, place dressed beets and citrus on top, dollop with remaining ricotta, sprinkle with reserved pistachios, and serve.