Peel the apples. Core and cut into 1/4-inch slices. Place in a Dutch oven, large soup pot or braiser, or similar sturdy-wide pot.
To the pot, add the sugar, salt, cinnamon, allspice, nutmeg, and flour. Toss to evenly coat the apples.
Heat the pot over medium-low heat. Cook, stirring periodically, until the apples just begin to give up their juices, about 10 minutes. Stir in the lemon juice.
Let cool completely to room temperature. To freeze, spoon the apples and any juices that have collected in the pot into a sturdy, ziptop freezer bag. Remove as much air as possible, seal, and freeze flat for up to 3 months. To use, let stand at room temperature for 20 to 30 minutes, until the filling loose enough to spread evenly into the pie crust (do not thaw completely).
Notes
*For tart, use a variety such as Granny smith; for sweet/crisp, I love Honeycrisp; varieties like Jazz, Braeburn, Fuji, Gala and Pink Lady are good too.
YIELD: About 8 cups filling, Enough for one 9-inch pie (deep dish or regular)
TO STORE: Apple pie filling will keep in the refrigerator for up to one week.
TO FREEZE: Transfer the apples and their juices to a sturdy zip-top freezer bag. Press out any air, then seal and freeze flat for up to 3 months.
TO REHEAT: Let the apple pie filling thaw in the refrigerator, then warm it up in the microwave or on the stovetop to use it as a topping.