Sauerkraut is the best first ferment for someone starting to dabble in making their own probiotic vegetables at home!
*want to use whey, but don't know where to get it? Yeah, you can't buy it, but you can make it! Take 2 cups of whole milk yogurt, and place in a colander or strainer lined with a clean dishtowel. Put the colander over a bowl big enough to catch the liquid that drips from the straining yogurt. Put the whole thing in the fridge, and allow to strain for at least 2 to 4 hours, or overnight. Save the liquid that drains away from the yogurt, because this is the whey! You can put it in a mason jar with a lid and it should keep in the fridge for up to 6 months. The strained yogurt is now what you would consider Greek yogurt--extra thick and creamy! Eat it as you would any normal yogurt.