Ms. Olsen grew up in Los Angeles and studied theater at New York University, cooking whenever a friend made a kitchen available. “I had a very foodie college experience,” she said. Between course work and understudying on Broadway, “I did not party, that’s for sure,” she said.
The rap on Hollywood actresses is that they subsist on green juices and aromatherapy fumes. Not Ms. Olsen. Though ambivalent about self-promotion (“The goal was never to be famous,” she said. “That’s why I went to school for theater.”), she has recently been more active on Instagram and likes to post awkward paparazzi shots that capture her devouring a Quest bar or tasting ice cream, with the tag #feedmefridays. Whenever she travels for a location shot, she said, she startles T.S.A. agents fits by filling her luggage with a set of spices and a trusted knife block.
“I’m so glad you said that,” said Stephanie Barlow Sarikaya, the cooking instructor. “It’s dangerous to use dull knives.”
Ms. Olsen nodded and told a story about being afraid that T.S.A. agents would confiscate her Veggetti, a device that makes zucchini noodles. (You could use it to shred an opponent, but only if that person stays very still.) Ms. Sarikaya laughed and then the two of them discussed whether to blanch noodles before saucing them; Ms. Olsen prefers a quick boil, while Ms. Sarikaya worries that it will leave the noddles too watery.
Two sauces simmered on the stove, and Ms. Olsen gave them an occasional stir. She declined the apron meant to protect her black silk blouse, black jeans and black boots but happily accepted a glass of prosecco.
The wine helped ease the arm soreness from a recent tennis game and the neck pain she’d woken up with, a likely whiplash injury from her “Avengers” stunts. (The next film in the series, “Avengers: Infinity War,” will open in 2018. Ms. Olsen plays the Scarlet Witch.) “When you’re pretending to get hit, that’s when you get it,” she said. She risked further injury as she enthusiastically kneaded pasta dough, zested a lemon and shaved a summer truffle.
Ms. Sarikaya said they now use dogs to find truffles.
“That’s so cute,” said Ms. Olsen, before learning that many old-school truffle hunters are missing fingers from having wrested the tubers away from the pigs.
“That’s horrible,” she said.
She had a lot of questions, about fast-acting yeast, and pepper grinders, and the sage…