Just tapped my Black Walnut trees in anticipation of the warmer temps this week. 8 taps on buckets this year. Trees appeared thawed, but not dripping sap yet...drill shavings barely damp.
2014: 1st year w/ 6 taps (Silver Maple, Black Walnut), evaporator = 26" diameter carbon steel wok on customized turkey fryer burner. Syrup had a maple-butterscotch-caramel corn flavor. Concentrated the sugar by freezing all sap before boiling ("poor man's R.O.") as an experiment.
2015 - Currently: 11 taps (Silver Maple, Black Walnut, Norway Maple).