6 tablespoon unsalted butter
6 larges Golden Delicious apples (or 3 Golden Delicious & 3 Bosc pears)
1 lemon, cut in half
5 large sweet potatoes, peeled and cut in medium-size chunks
1 cup dark muscovado sugar
Salt and freshly ground black pepper to taste
Crisp Topping:
3/4 cup dark muscovado sugar
3/4 cup all-purpose flour
6 tablespoons unsalted butter, chilled and cut in small pieces
3/4 cup whole pecans, broken into quarters