Step 3
Combine apples, pears, onion, vinegar, sugar, cherries, lemon, mustard seeds, salt, cinnamon, ginger, allspice, and cloves in a wide, nonreactive 4-quart pot over high heat and bring to a boil. Once it bubbles, reduce heat to medium; simmer gently, stirring often, until mixture is thickened and a spoon drug through leaves a trail that doesn't fill in immediately, about 1 hour. Toward the end of the cooking, make sure to stir every minute or so to prevent scorching. Remove from heat.