We often imagine that mousse requires cream, a long list of ingredients, and a bit of pastry magic. In reality, it only takes four things we almost always have in the fridge: lemons, eggs, sugar, and a pinch of salt. Fifteen minutes of work, two hours in the fridge, and you get something elegant.

In glasses, the mousse is a pale, almost pearly yellow — not at all the aggressive yellow one might fear. The slightly domed surface barely trembles when you set the glass on the table. As you approach, you catch the scent of lemon zest, fresh and sharp, escaping softly. And in the mouth, it’s that particular feeling of well-made mousses: a lightness that melts immediately, followed by a sharp acidity that awakens without ever being harsh.