Mushroom Caps with Pesto

Pesto-stuffed mushroom caps are the appetizer that always disappears first. Cleaned mushroom caps get a generous spoon of fresh basil pesto, a walnut half pressed on top for crunch, and then a quick roast in a hot oven until the mushrooms release their juices and the pesto turns aromatic.

The pesto comes together in a single blender whir. Toasted walnuts or pine nuts, two cups of fresh basil, garlic, Parmigiano-Reggiano, and olive oil go in together and emerge as a thick green paste. That’s it.

Keep the mushrooms whole and remove the stems with a gentle twist, which leaves the cap intact for stuffing.

Kitchen Tips

• Wipe mushrooms with a damp paper towel instead of rinsing. They absorb water like sponges and turn soggy in the oven.
• Save the stems for stock or chop them fine into the pesto for zero waste and extra mushroom flavor.
• Drain the baked caps on paper towel before serving. The juices pool inside and run down chins otherwise.
• Use freshly grated Parmigiano-Reggiano. Pre-shredded cheese has anti-caking agents that make the pesto sandy.

Variations

• Swap basil pesto for sun-dried tomato or arugula pesto for different flavor profiles.
• Top each cap with a small cube of fresh mozzarella alongside the nut for a melty surprise.
• Use cremini or baby portobello caps for a deeper, earthier mushroom flavor.