Heat the oven to 400°F. Cut the baguette into 24 half-inch rounds, arrange them on a baking sheet, brush with olive oil and bake 8-10 minutes, until crisp with golden edges.
While the toasts bake, whip the ricotta with the 2 tablespoons olive oil, lemon zest, salt and pepper in a food processor for 1-2 minutes, until smooth and fluffy.
Let the toasts cool for 2 minutes, then spread each with about 1 tablespoon of the whipped ricotta.
Top with the pomegranate arils, drizzle with honey and finish with rosemary and flaky salt.
Serve within 30 minutes, since the toasts soften as they sit; the whipped ricotta keeps in the fridge up to 2 days, so it can be made ahead.