This simple dessert sauce offers a bold banana flavor augmented by the complexity of demerara sugar. It's a perfect topping for dessert on a cold night.

2 large, over-ripe bananas, cut into pieces (I buy bananas a week ahead and allow them to ripen.)
1 cup demerara sugar (I use Domino brand.)
1 tablespoon fresh lemon juice
4 tablespoons butter
.5 teaspoon kosher salt

Combine all ingredients in a medium-size saucepan. Barely simmer over low heat, mashing the bananas with a fork. Reduce this liquid mixture until it looks like dark applesauce. Stir frequently to avoid burning. It should take 30 to 40 minutes to achieve a thick sauce. Cool a bit before serving; it will be very hot.