French pistou sauce is like a nut-free version of Italian pesto. This Southern take comes from chef Sean Brock, and it's served with his Crispy Soft-Shell Crab.
Bring a large pot of water to a boil over high heat. Prepare an ice-water bath and set aside. Add pea shoots to boiling water and cook until crisp-tender, about 1 minute. Drain and transfer to ice-water bath to cool. Drain and pat dry, removing any excess water.
Very finely chop pea shoots and transfer to the jar of a blender, along with garlic, vegetable stock, and xanthan gum; blend until smooth, about 2 minutes. With the motor running, slowly drizzle in olive oil. Season with salt and pepper. Strain through a fine-mesh sieve; serve.