Ken has been boiling down the sap and yesterday we brought the first batch in to finish and bottle.
We strained it into two flat stainless pans and two pans. As the sap evaporates, we added sap from the pans to the flat stainless pans so there was more surface area.
Then I boiled water to find the exact temperature it boiled - this actually varies with humidity, etc. We boiled until the sap became syrup - eight degrees above the temperature water boils. And then we filtered and bottled.
If you have bottles like this, please save them for us- we will gladly reuse them!