Preheat oven to 425º F.
Prepare your acorn squash: carefully slice 2 pieces all the way down the middle of each acorn squash. Remove stem first if you have trouble.
You should have 4 halves. Once halved, slice a thin piece off the round bottom of each half. With a spoon, scoop out the seeds and membranes; discard or reserve to roast later. Cut butter into 1-tablespoon pats (for a total of 4 tablespoons).
Place cut side up on a baking sheet and sprinkle with salt. Roast for 15 minutes then remove from oven and place a pat of butter in each half. Measure 1 tablespoon each of maple syrup and pour into the cavity of each half (4 tablespoons divided).
Continue roasting another 25-35 minutes or until flesh is very soft and easily forced with a fork, basting every 10 minutes or so.
To baste, pull out oven rack with baking sheet and, with a pastry brush, baste the top edge of each half of squash with the melted maple butter, then return to oven.
When acorn squash pieces are roasted, the flesh is soft, and the surface is browned with a few dark brown spots, remove from oven, let stand a few minutes, and serve.