When the garden is overflowing with zucchini, pickle them and put them on burgers, sandwiches, or enjoy one by itself. Make sure to not skip the step of salting and then submerging them in ice water: It's the secret to long-lasting snap.
In a large bowl, toss zucchini with 2 tablespoons salt; let stand 20 minutes. Cover with ice and water, weighting down with a plate, if necessary, to keep zucchini fully submerged. Let stand 1 hour. Drain in a colander; rinse to remove excess salt. Pack zucchini and dill into a 4-cup-capacity or two 2-cup-capacity jars.
In a medium saucepan, combine vinegar; 2/3 cup water; mustard, cumin, and celery seeds; garlic; jalapeño; sugar; and 1 tablespoon salt. Bring to a boil over medium-high heat, stirring until sugar dissolves. Carefully pour into jar with zucchini and dill. Top with more vinegar, if necessary. (Liquid should fully submerge zucchini mixture and reach about 1/2 inch from top.) Let cool completely, then cover and refrigerate until ready to use, up to 1 month or try canning with our helpful instructions.
If using larger zucchini, halve them crosswise, then cut lengthwise into approximately 1/2-inch-thick wedges.