Sauté the onions and half of the garlic in olive oil until the onions begin to turn translucent.
Add the greens and sauté until they are tender.
Take off heat and set aside to cool.
Add chickweed, pecans, olive oil, tahini, and feta to a blender or food processor.
Add the remaining garlic to the blender (depending on your love of garlic add more or less) and then add the greens when they are cooled a bit.
Blend by slowly adding the greens, blending, and adding more greens until your pesto is coarsely ground.
Feel free to add more olive oil for a creamier consistency. If you’ve ever blown the motor in a blender, you know how important it is to not stress the blender to overheating.