Understand why samosas lack surface blisters and how to tweak dough and frying to fix it.
Lack of blisters on samosa crusts usually means the dough was too soft or not rested enough before rolling and frying.
To develop blisters, the samosa dough should be firm, kneaded well, and rested for at least 30 minutes. The addition of a small amount of fat (moyan) helps flake formation. Rolling the dough neither too thick nor too thin, and frying on low-medium heat, allows blisters to form slowly.
Try adding a teaspoon of semolina to the dough for an extra bubbly crust.