I'm not going to Burn them with fire as I lime biodiversity, but I'm interested - what bug would lay lots of tiny cream eggs on recently cut grass? They're messy and stuck to grass/ buttercup, about the same amount as a ping pong ball in total.
Pics below if I make it work, didn't want to traumatise anyone.
I'm in Edinburgh, weather is warm and grey, grass was cut 2 days ago, bordering a nature reserve.