Every December and January, farms around Surat roast bundles of young green jowar heads over embers and thresh out ponk, soft, sweet, pale-green grains that last only a few weeks. Surtis turn the trip into a picnic, eating ponk by the handful with lemon-pepper sev and garlic chutney, then frying the leftovers into these crunchy vada. The grains are crushed coarsely with chilli and ginger, bound with a little gram and rice flour, and fried until the outside is lacy and crisp while the inside stays tender and grassy-sweet. Look for frozen ponk in Gujarati grocers outside the season. Chef's tip: crush the ponk only roughly; whole grains popping through the crust is what makes these vada special.