growing cucumbers

They look like tiny watermelons, but taste like cucumbers. What the heck are they? That's what most people say when they lay eyes on a Mexican Sour Gherkin cucumber. It's an heirloom variety that keeps gardeners from getting bored. We first saw them at the Culver City Garden Show, where fellow gardenerd Elizabeth Camp was showing them off. One look and we knew they were a garden must.  We grew them this summer in our Test Garden, so here's the…