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Since lemon beurre blanc is traditionally paired with fish, we created this bright, acidic sauce to allow you to sous vide cod in it, then pair it with mashed potatoes and green beans. This classic French butter sauce has lots of bright, lip-smacking lemon, with a touch of koji for sweetness and umami. It’s creamy, acidic, and will be gone from your plate soon. You can pair it with any kind of fish, chicken, pork, or tofu. Simply put the protein—in this case, cod—into a bag with this sauce and sous vide it. This is a fully flavored meal with little time required from you.