Makes 1 quart INGREDIENTS 3 medium green (unripe) mangoes, peeled and cut into small cubes ½ cup kosher salt 3 tablespoons turmeric 1 teaspoon fennel seeds 1 tablespoon black mustard seeds, coarsely ground in a mortar and pestle or spice grinder ½ tablespoon fenugreek seeds, coarsely ground ½ cup cayenne pepper 1 cup canola oil…