Hǎo de hóngshāoròu guānjiàn zàiyú dǐzhī de wèidào.
Good red-braised pork comes down to the flavor of the base sauce.
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底 (dǐ) = 'bottom / base', 汁 (zhī) = 'juice / liquid' — literally 'base liquid', i.e. what sits at the bottom of the pot and underpins the dish's flavor.