Preheat oven to 400 F. Place butter in pan and place in oven to melt. Swirl pan to grease bottom and sides. Steam asparagus lightly. Place in bottom of pan. Mix milk, flour, eggs and salt in blender. Pour over asparagus. Bake until puffed and golden brown, 20 – 25 minutes. Sprinkle cheese on top, cut into wedges and serve.
Fresh herbs*, wild leeks*, fresh sweet peppers* may also be added.