The most discussed cook book over the last few years has most certainly been Natural Harvest - quite an interesting phenomena to anyone even slightly interested in cultural taboos. Semen and this viili I just made have at least two things in common. The oblivious one is the way they look. The second one is that strictly speaking, neither one is a vegan ingredient. But as I found out, viili could be.
Viili is a fermented milk product popular around Scandinavia and probably my personal favourite. Compared to yogurt it's rather sour and has a structure much more ropy (here's a demonstration). It can be eaten as such or with jam, talkkuna or ryecrisp pieces. I've never seen it sold vegan but it turned out just as easy to prepare with vegetable milks as it is with cow milk. Micro organisms usually aren't too picky.
You need couple of spoonfuls from an older viili batch to get the bacteria. This is most easily done by buying a jar of non-vegan viili, unless you have a chance to come and get some straight from me. Then you just need to fill the cup with milk, mix it a bit and leave uncovered on some warm place overnight. Next day you can refrigerate the cup. It takes a few more days for the taste to evolve right. Check now and then to find your preferred intensity.
The front cup in the photo with the velvety fungus surface is made out of soy milk. I used a sweetened brand but the basic taste was quickly run over by the characteristic taste of viili. The oat version didn't look as adorable but I actually preferred its taste. Oat milk is usually much thinner, forms some watery spots and takes longer to mature so I used a dollop of oat cream in it as well. The result can be seen in the background.