Chef John's Lobster Mac and Cheese
You can actually prep these ahead and bake before that romantic, possibly Valentine's, dinner. You probably want to take them out and let them warm up for 30 minutes before baking. By the way, only bake these until the tops are browned and the inside is just hot.
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Make sure your mac and cheese mixture is wet and saucy in the pan, otherwise it might get dry when it bakes. Don't be afraid to add a splash of the pasta water to loosen things up.