>I know that peaches and the peach family of fruits are standards on allergy
>tests (the skin-prick type), so it must be a common allergy.

        I have known several people allergic to this family.  They all have the
tingly burning mouth.  One woman's father owned a fruit market!  The baking
soda trick (1/2 tsp., then drink water) will stop the burning.  Also works
for scratchy throat from cantelope and honeydew.