Heat the oven to 400°F.
Gently combine the topping ingredients: Pecans, brown sugar, coconut, butter, ground ginger, and salt. Set aside while you prepare the filling.
Melt 4 Tbsp. butter in a 12-inch ovenproof skillet over medium-low heat. Add the brown sugar, flour, fresh chopped ginger, and salt; cook, stirring, until the sugar is melted and the mixture is smooth for a few minutes. Whisking constantly, add the apple butter (or applesauce) and lemon juice and cook until boiling, about 2 minutes.
Reduce the heat to low and add the apples. Cook, stirring gently, until just barely tender, about 4 minutes. Add the pears and gently toss until coated and hot, about 3 minutes. Remove from the heat.
Sprinkle the topping evenly over the fruit. Bake until the fruit is very tender and the topping is browned, 25 to 35 minutes. Let sit for about 10 minutes to allow the juice to settle and thicken before serving.