This dish is somewhat akin to mash potatoes with green beans, just with a couple twists. The most obvious is the parsnip puree instead of potatoes. The parsnips bring with them a carrot-y flavor that feels cozy for the cooler nights as fall nears. You could swap the stock for any liquid (other stock, water, or milk). In restaurants, cream is most likely what is used. The green beans are simply prepared as you would for green bean almondine, just with pumpkin seeds (pepitas) instead of almonds which have a buttery flavor that adds a lot to the green beans.
Blender, immersion blender, or food processor.
Spoon the parsnip puree into a wide shallow bowl, offsetting slightly. Then pile on the green beans slightly offset from the puree.