Peel the mushrooms and cut into thin slices. Chop the garlic and cut the asparagus in half. Put everything without oil in a coated pan with the spinach.
Sweat the vegetables and add 1 heaped teaspoon vegetable stock. Finally, season with salt, pepper, a splash of lemon juice and possibly some chili powder.
I think the recipe is good as a main course, but of course you can also serve it as a side dish or possibly with ribbon noodles.