>>2812172The reason you can’t finish a small batch in the tray is that it will be spread too thin and not cook evenly, so there’s a risk of overcooking or burning sugar.
It’s all a bunch more pleasant when there’s snow, but even on dry years like this year, it’s pleasant to sit out with the stove, burning wood and watching the stars, checking on the fire and on the sap and skimming off any debris or protein foam as it cooks out of the sap.