Cut the potato in to half and pressure cook it until soft. Let the pressure subside naturally then peel off the skin from potatoes, crumble it well and keep aside.
Heat a pan with oil, cumin seeds and grated ginger. Saute for while. Add in fresh peas and all the spices like turmeric powder, red chilly powder, garam masala, amchur powder and salt. Mix well.
Include crumbled potatoes and stir well for stuffing to come together. Finally add coriander leaves, mix and keep it aside. Samosa stuffing is ready, lets proceed with dough.
After the resting time, knead dough once again and divide it in to 10-12 balls. Take a ball, apply some oil over and roll it in to medium thickness oval. Then cut in to half horizontally.
Take one of halves and apply little water at the cut edge. Bring it together in to cone shape and fill 3/4 of it with prepared stuffing.
Make a single pleat just opposite the to the sealed side. Apply little water to that edge and seal it with opposite edge. This gives triangular samosa shape.
Repeat the process with all the dough balls. And keep a batch of samosas ready to fry. Meanwhile heat a pan with enough oil and when the oil gets heated up, keep the flame to medium and drop a batch of samosa in to oil.
Fry them in medium flame till the crust turns brown, once done remove from oil using a slotted ladle and drain on kitchen tissue paper.
The famous snack potato samosa is ready to serve with green chutney and tomato ketch up.