Most store-bought ricotta is dry enough that it shouldn't require straining, but if you have an especially wet, fresh ricotta, you may want to strain it first. To strain, line a fine-mesh sieve with cheese clothe and spoon the ricotta into the sieve. Let the ricotta strain for about 10-20 minutes, and you'll be good to go. It doesn't need to be bone dry, but we don't want to add any big puddles of whey.