pineapple juice
Juice pressed from pineapple, sweet with a distinct tang, used in marinades, drinks, and glazes. Like the fresh fruit, unpasteurized or fresh-pressed juice carries an active enzyme (bromelain) that can tenderize or even oversoften meat in a marinade; most bottled juice has been heat-treated and lacks this effect.
Buying guidance
Choose 100% juice rather than a juice drink or juice cocktail when real pineapple flavor and acidity matter -- the diluted versions carry noticeably less of both despite looking similar on the shelf. Check whether it's shelf-stable, usually meaning from concentrate, or refrigerated, meaning not from concentrate -- the refrigerated kind tastes fresher but spoils faster once opened.
Substitutions
- Orange juice -- sweet with less acidity; fine for drinks, weaker as a meat tenderizer.
- Fresh-pressed pineapple juice -- keeps the enzyme activity bottled juice lacks, useful where tenderizing is the point; don't over-marinate with it or the texture turns mushy.
- Apple juice with a squeeze of lime -- approximates the sweet-tart balance without the enzyme.
Tips & common mistakes
Pineapple juice's natural sugar makes it prone to scorching and turning bitter if reduced or simmered over high heat in an open pan -- reduce it over medium or lower heat and watch it closely toward the end rather than trusting a hard boil to hurry it along.
Storage
Once opened, refrigerate it tightly capped -- the combination of sugar and acidity means a bottle left too long can start to ferment slightly at the surface, showing up as a faint fizz or off smell before the taste noticeably changes.