In a medium saucepan, combine apples, lemon juice, cinnamon, and salt. Cover, and cook over low heat, stirring occasionally, until the apples break down to a sauce-like consistency.
Remove from heat, uncover, and let stand until apples cool slightly. Using tongs or chopsticks, discard skins and mash apples for a chunky consistency. Use immediately, or store refrigerated, in an airtight container for up to 1 week.