January 06, 2015 03:15 PM

Marion Curtis/Startraks

She gave birth six short weeks ago, but Gaby Hoffmann was ready for a Girls night.

The actress showed off her slender post-baby body at the HBO show’s season four premiere in N.Y.C. on Monday — and shared her secret to bouncing back.

“Placenta, placenta, placenta. Just eat that s— up, and it does a girl good!” Hoffmann, who guest-stars as Adam’s out-there sister in the hit series, told PEOPLE, noting it boosted her energy and milk supply.

The actress, 32,  and longtime boyfriend, cinematographer Chris Dapkins, welcomed daughter Rosemary on Nov. 19 at home and says getting those nutrients from the birth organ was easy. “You don’t taste [it],” she explains.

“I made smoothies out of it for three weeks. I had a home birth, so my midwife and my doula took it and cut it up into 20 pieces and froze it, and every day, I put it in a blender with strawberries and blueberries and guava juice and a banana, and I drank that s— up.”

With her healthy snack all gone, the actress was saying “bottoms up” with another beverage during her evening out.

“I’ve been home with my baby. It’s my first night out. Coming out to a party at the Museum of Natural History where you get to watch Girls and have a drink with your friends?” the Transparent star says. “What better night out [is there]?”

— Jeff Nelson

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