Mix flour, salt, butter, and shortening; add water to form dough, divide, chill 30 minutes.
Cook peaches with sugars 8–10 minutes; mash, thicken, add butter and lemon, then cool.
Whisk glaze ingredients until smooth; adjust consistency.
Roll dough, add filling, fold, seal, and crimp edges.
Fry at 350°F for 3–4 minutes until golden; flip halfway.
Brush glaze on warm pies, let set, then serve.