1. Puree all ingredients except the mushroom caps in a blender.
2. Toss with the mushroom caps.
3. Broil on a rack in a broiler 4-8 minutes or until lightly browned. Broilers differ greatly, so check often to make sure the boletes don’t begin to burn.
4. Turn with a spatula, tongs, or fork and broil 4-8 minutes, or until you’ve lightly browned the other side.