Pesto is mainly made from basil, pine nuts, and olive oil.
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派斯托 is a phonetic loan, but in everyday menus and home-cooking blogs you'll more often see 青酱 (qīngjiàng — 'green sauce', a calque) or just 罗勒酱 (luólè jiàng — basil sauce). 派斯托 reads as more 'imported' or 'authentic Italian'.