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Proctor maple lab was running it off two 3x10 evaporators, running wide open. They don't use a double boiler or lower temperature.

We were at Proctor Maple Research Lab last week and they were boiling birch sap. A couple things I learned.

1. It's not "syrup" like we think of syrup. It's a delicacy for chefs and suvh, but to...