Whether you’re cooking for vegetarians, flexitarians, or anyone burger-curious, these are the plant-based patties worth buying — just in time for summer.Credit: Photo by Morgan Hunt Ward / Food Styling by Lauren Odum / Prop Styling by Abby ArmstrongPlant-based burgers, once overly dry or mushy with flavors that left much to be desired, have come a long way. The category has significantly improved in quality and expanded well beyond its early lim…