While its texture isn't quite the same as minced ginger, ginger juice is literally just juiced and strained gingerroot, so it serves as a near-exact analogue in beverages, anything pureed, or as part of a sauce or marinade. I also like to keep a bottle in my fridge even when ginger is in season for when I only need a small quantity of ginger and don't feel like busting out my Microplane.
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If you've ever had the misfortune to slice into a fresh knob of ginger only to find a bland, unappealing, and fibrous gray ring within, you may have surmised that ginger (like most produce) has a defined season. From August till November (and through February, thanks to cold storage), fresh may be the way to go; the rest of the year, try substituting store-bought ginger juice 1:1 for grated or minced ginger for the tastiest results.