Today's spring soup recipe: A bowlful of our favorite spring vegetables, especially artichokes and asparagus. Low Cal. Low Carb. Gluten Free. The seductress that is Spring is toying with us here in St. Louis. For a few days, she taunted us with warm – hot, even – days, luring us into the impression that "Spring is really here!" For years, I've tracked the very day in my estimation when spring really arrived and 2011 (and again now, in 2016) was looking record early by some days. But no. The real spring has yet to arrive. As I write, there is new snow on the ground and tomorrow's outdoor birthday party is moving inside. Still, spring will come and it helps to bridge the seasons with what I think of as "bridge foods" – in this case, a big potful of soup that simmered on the stove. But this is no heavy stew or meaty soup of winter, instead, a potful of spring vegetables. I envisioned an all-green soup – thus the celery, asparagus, artichokes, peas a...