- 1 angled loofah (1/2 lb)
- 2 tablespoons kosher salt
- 2 cups ice cubes
- 1 cup cider vinegar
- 1/2 cup water
- 3/4 cup sugar
- 1 teaspoon mustard seeds
- 1/2 teaspoon celery seeds
- 1/4 teaspoon turmeric
- 1 medium sweet onion (1/2 lb), thinly sliced crosswise and separated into rings
- Scrub loofah and peel only the ridges, then cut diagonally into 1/2-inch-thick slices. Toss loofah with kosher salt in a bowl, then cover with ice and let stand 2 hours. Drain and remove any unmelted ice.
- Bring vinegar, water, sugar, mustard seeds, celery seeds, and turmeric to a boil in a 1-quart nonreactive saucepan, stirring until sugar is dissolved. Add loofah and onion, then reduce heat and simmer, uncovered, 5 minutes.
- Transfer pickles with liquid to a 1-quart heatproof glass or ceramic bowl and cool to room temperature. Chill, covered, at least 2 days (for flavors to develop) and up to 1 month.