Heat the oven. Preheat to 375°F. Arrange pear halves cut side up in a baking dish that holds them snugly.
Butter and season. Brush the cut sides with melted butter, then sprinkle with cinnamon and a pinch of salt.
Sweeten and top. Drizzle with honey and scatter chopped walnuts over each half.
Bake until tender. Bake for 30 minutes, until a knife slips easily into the thickest part of a pear; very firm pears may need 5 minutes more.
Serve warm. Serve warm with yogurt or ice cream, spooning any syrup from the dish over the top.