Q.What The Heck Is This
This was in the garden last night so I blasted it away with the hose. It was back again this morning. Any ideas what it is?

Certified GKH Gardening Expert
It is a slime mold. It is quite beneficial for your lawn, actually. It is just a little unsightly.
I would leave it alone, as it is probably consuming some lawn infection- doing quite a service for your lawn.
Here is some information on the subject: https://www.gardeningknowhow.com/ornamental/fungus-lichen/what-is-slime-mold-slime.htm

It may look disgusting but it is a completely benign fungus. In the USA, we call it "slime mold" or less commonly, "dog vomit fungus". Typically they are a 1 or 2 day phenomenon then disappear completely. Here is an article with more details: https://www.gardeningknowhow.com/ornamental/fungus-lichen/what-is-slime-mold-slime.htm