Following recommendations, I stopped yesterday at Bubby'Burritos. This is a little, old trailer/caravan parked adjacent to the Montgomery Orchards farm stand on Rtes. 9 and 199 in Red Hook not far off the Rhinecliff Bridge. The burrito with guacamole was, as promised, tops! Apparently this place has a huge local clientele, and with good reason. It's closing for the season on the 30th, according to the sign. If you're in the area, it's worth stopping.