Divide the dough into four equal parts. Roll out two portions ⅛ in/0.3 cm thick and line the pie pans. Reserve the remaining dough, wrapped tightly, under refrigeration.
Bring 1 lb 8 oz/680 g of the blueberry juice, the sugar, and salt to a boil in a saucepot.
Combine the remaining 4 oz/110 g blue berry juice with the clear gel starch and mix until sm