In the bowl of a food processor fitted with the steel blade, whiz the drained ricotta, sugar, vanilla, lemon zest, and juice until very smooth, about 5 minutes. Stop the processor once or twice during blending to scrape down the sides of the bowl to ensure the whipped ricotta is evenly silken.☞ TESTER TIP: Yep. Five minutes may seem like a long time. But wait until you experience the superlative texture of the resulting cream.