*You can sub white wine vinegar (+ a few good pinches of salt), for the umeboshi vinegar - however the ume vinegar brings a nice “umami” flavor that other vinegars don’t. (Find it at whole foods in the asian section or buy it online
Look for sunflower seeds in the bulk bins that are already hulled. If you can only find skin-on seeds, don't worry about peeling them (it's tedious). It’s creamier with hulled seeds, but will taste fine nonetheless.