Pollan says that his family would be "eating alone together" because they were all eating the same meal, but each person was eating a different version of it. They were eating together, but each person's meal was tailored to their individual tastes and preferences. This is because Pollan's family was experimenting with the idea of each family member cooking their own meal, based on the same set of ingredients. Pollan wanted to explore the idea of personalizing meals, while still maintaining a sense of togetherness and shared experience.

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