In a large pot, bring apples, water, and cinnamon stick to a boil over high heat, then reduce heat to medium-low and simmer until apples are tender, about 15 minutes. Mash until chunky.

Add strawberries and cook another 5 minutes. Remove cinnamon stick. Using an immersion blender, puree until the mixture reaches a consistency you like. Remove from heat and stir in sugar to taste.

Serve warm or chill until ready to serve.