As a harvest of beans has been steadily coming in for several weeks now and the heirloom tomatoes are starting to blush, I’ve been thinking on the idea of a single serve garden. Some days we haul in a grocery bag of beans, squash and cucumbers, and other days it’s just a handful here, and a sprig of something there. Several weekends ago I wanted to saute squash for guests and didn’t have enough for everyone, so I threw in…