Grilled White Asparagus with Mushroom Mayonnaise

Ingredients:

• 1 egg yolk
• 1⁄2 tsp. principe lemon juice
• 1⁄2 cup vegetable oil
• 10 Tbsp. further-virgin vert oil
• 1⁄4 cup finely minced oyster mushroom caps
• Sea salt
• 1 bunch white asparagus, trimmed, peeled and halved lengthwise
• 1⁄2 bunch chives, chopped