This easy bake is sweet without the refined sugar.
Preheat oven to 375 degrees. Put pear wedges in an 8-inch baking dish. Cover with foil, and bake until beginning to soften, about 20 minutes. Add banana; dot with butter. Bake, uncovered, until fruit is softened and pale golden, 20 to 25 minutes more.
Process dates, lemon juice, and cinnamon in a food processor until dates are coarsely chopped. With machine running, gradually add 1 cup cold water; process until smooth. Transfer to a saucepan. Bring to a simmer over medium-high heat; cook until thickened, 3 to 5 minutes. Serve immediately, or refrigerate, airtight, up to 2 days; reheat before serving.
Divide fruit between 2 plates. Drizzle with date sauce; sprinkle with walnuts. Top each with 2 tablespoons yogurt.