For those who are tempted by the convenience and whimsy of spraying whipped cream out of a can but who don’t like the artificial flavor in commercial products, there are now nitrous-oxide–charged whipped cream dispensers. Fill the canister with heavy cream, insert a nitrous oxide charger, and your cream is whipped. It’s pretty fun, it’s spontaneous, and it has staying power (once “charged,” the cream will hold in your refrigerator for two weeks). We like iSi’s Mini Whip ($43.99 in brushed aluminum, or $39.99 in white, at isi-store.com). You can add flavorings like coffee, cocoa, or liqueurs, but to sweeten the cream, you must use confectioners’ sugar or a syrup, not granulated sugar, to avoid clogging the dispenser.