Ingredients

• 4 lb small yellow squash and green zucchini, scrubbed and cut into 1/4-inch-thick rounds (12 cups)
• 2 large onions, cut crosswise into 1/4-inch-thick slices
• 1/4 cup plus 1 1/2 teaspoons canning salt
• 1 quart crushed ice
• 2 1/4 cups cider vinegar
• 1 cup pure maple syrup (preferably dark amber)
• 3/4 cup water
• 1 tablespoon mustard seeds
• 1 teaspoon whole allspice
• 1/2 teaspoon celery seeds
• 6 (4- to 5-inch-long) fresh red chiles such as Holland red hot finger peppers
• Special equipment: 6 (1-pint) canning jars with lids and screw bands

Instructions

1. Toss together yellow squash, zucchini, and onions with 1/4 cup canning salt and crushed ice in a large bowl. Press a plate directly onto vegetables and place a 5-pound weight on top (a bag of sugar in a sealed plastic bag works well). Let stand at room temperature 4 hours.
2. Sterilize jars and lids .
3. Bring vinegar, syrup, water, mustard seeds, allspice, celery seeds, and remaining 1 1/2 teaspoons canning salt to a boil in a 3-quart saucepan, then simmer, uncovered, 10 minutes.
4. Cut a lengthwise slit in each chile (don't cut all the way through), then add chiles to pickling liquid and continue to simmer 1 minute.
5. Drain jars upside down on a clean kitchen towel 1 minute, then invert.
6. Drain vegetables in a colander set over a bowl to catch liquid, then pack into jars, tucking a chile pepper into side of each jar. Fill jars with pickling liquid, leaving 1/4 inch of space at top, then run a thin knife between vegetables and jar to eliminate air bubbles.
7. Seal, process, and store filled jars , boiling pickles in jars 20 minutes.
8. Let pickles stand in jars at least 1 week for flavors to develop.