For better results with mushroom identification in the future, try to get photos of the underside and stipe of mushrooms. The more pics the better chances of ID. Providing a rough location can also be beneficial. From what I can tell this mushroom is likely some type of oyster mushroom (Pleurotus sp) or maybe a flat crep (Crepidotus applanatus)

Looks great! I see some hedgehogs, and chanterelles, is that amethyst deceiver on the right?

Check out Gremolata and/or Pangrattato. It's a Mediterranean herb and bread crumb crumble with lemon zest. Sounds like what you're looking for. You can always mold the recipe to your own taste with different herbs.

I have! I had success with bulk poppy seeds from a bakery. I have heard of people using grocery store seeds. You'll want to make sure they're fresh seeds/haven't been sitting in the pantry for years. Depending on where you live, it's best to sow them right before the last frost. What I do to recreate this is to put the poppy seeds in freeze for at least 24 hours before I sow the seeds.