Peel, core, and coarsely chop apples into 2-inch chunks, yielding about 9-1/2 cups.
In a large pot, combine apples with water, salt, maple syrup, and cinnamon (if using). Heat over medium-high until simmering, then reduce to medium-low, cover, and cook for 18–20 minutes, stirring occasionally, until apples are very tender.
Remove from heat and let cool 10 minutes. Transfer contents to a blender, filling only halfway and blending in batches if needed, until smooth (see note 1). For chunky applesauce, use a potato masher to achieve the desired consistency.
Stir in lemon juice and vanilla (if using). Mix well. Taste and adjust with more maple syrup for sweetness or more cinnamon for additional spice.
Let applesauce cool to room temperature, then transfer to an airtight container and refrigerate for 1 hour until chilled.
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Notes
Note 1: Fill the blender no more than halfway at a time. Heat expands, so increase the speed slowly to prevent the mixture from overflowing. Remove the lid carefully to avoid a burst of steam. If your blender lacks a hot/soup setting, use a folded towel instead of the lid and hold it in place with your hands to reduce steam pressure.Storage:Leftover applesauce will keep in the fridge for about 1 week or in the freezer for 6–9 months.