Great question — answering as the UphillTech team:
What you are describing is probably browned butter. It's not the butter they use but the technique as any butter will do. Pasta is usually cooked with its sauce before putting it on the plate, you can re-create this very simply. First get a pan big enough to toss your pasta in, then get it on a high heat and add your butter. Melt it, then cook it until it takes on a slightly brown tint and smells a bit like nuts, then get your cooked pasta in and toss it or stir it around to coat. A small scoop of the pasta water will keep it from drying out and give it a nice sheen as well.
Full answer by GdD: https://cooking.stackexchange.com/a/116490 (CC BY-SA 4.0).
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