Blanch 1/3 pound each halved baby carrots, green beans and yellow beans, 2 to 4 minutes. Cool in ice water, then put in a glass bowl with 1/2 sliced red onion. Make the brine: Boil 2 cups each white vinegar and water, 1/4 cup kosher salt, 2 bay leaves, 3/4 cup sugar, the zest and juice of 1 lemon, and 1 teaspoon each peppercorns and coriander seeds; pour over the vegetables, then let cool. Chill at least 4 hours.
Photograph by Con Poulos