Cut fruit into eighths (do not core); place in a heavy medium saucepan. Add water, lemon juice and lecithin and bring to a simmer. Reduce heat to low; cover and simmer, stirring and mashing fruit occasionally, until mushy, 35 to 45 minutes. Let cool slightly.

Press through a fine sieve (or food mill fitted with a fine grate) into a bowl. (It will have an applesauce-like texture.) Let cool completely. The fruit puree will keep, covered, in the refrigerator for up to 4 days or in the freezer for up to 6 months.

Per Serving (one tablespoon): 15 calories, 0g fat, 0mg sodium, 0mg cholesterol