Most people know avgolemono as a lemony Greek chicken-and-rice soup that’s thickened with egg yolks. In this vegetarian version, the lemon–egg yolk combo is used to make a creamy, tangy carbonara sauce for linguine and sliced Swiss chard.
Tender Swiss chard breaks down easily in a regular blender for smoothies that need no straining. Since red chard veins can bleed color, choose green chard to keep the verdant hue. Reserve chard stems for another use.
In Native American lore, the three sisters refer to corn, squash, and beans, which were traditionally grown together. The cobbler filling can be made ahead and baked with the topping just before serving.
A torta is a free-form, double-crusted pie that requires no special pie dish. Serve with steamed carrots or roasted root vegetables. For more robust flavor, you can substitute kale or collard greens for the Swiss chard.