 The easiest way is to engage them in conversation. Most vendors are eager to talk about their operation and products. Are they selling produce that's in season locally? A pineapple seller in Maine is probably sourcing his product elsewhere. And sneak a peek behind the display. Boxes marked with mass producer brands or clamshell packaging are signs it wasn't pulled from the farmer's field that morning. That is the Old Farmer's Almanac Radio Report. Have a question for the old farmer? Ask it online at almanac.com.