This is my absolute favorite. They're great as a snack or on the side of a ton of stuff. I've found you usually need more water than indicated for the dough, though, and have never tried the pomegranate seeds. Pomegranates intimidate me.

You can use garlic powder in place of the asafetida powder if you don't have any.
Vegetable Samosas
2 tablespoons milk
oil for deep frying
chutney, to serve
Dough
4 1/2 cups all-purpose flour
1 teaspoon salt
3/4 cup soft margarine
5/8 cup water
Filling
1 tablespoon ghee, or vegetable oil
pinch of asafetida powder
2 teaspoons mustard seeds
1 pound potatoes, parboiled and diced
1 cup cooked peas
2 fresh green chiles, seeded and chopped
1 teaspoon salt
1 teaspoon pomegranate seeds (optional)
1 teaspoon garam masala
2 tablespoons chopped fresh cilantro leaves
Sift the flour and salt into a large mixing bowl to make the samosa dough. Cut the margarine into small pieces and rub it into the flour with your fingertips, until the mixture resembles fine bread crumbs. Stir in the water, a little at a time, until it is all amalgamated. Knead thoroughly until you have a smooth dough. Cover with a damp cloth.
Make the filling: heat the ghee or oil in a skillet and add the asafetida powder, mustard seeds, potatoes, peas, chiles, salt, and pomegranate seeds, if using. Stir well over a moderate heat for 2 minutes. Cover the pan, reduce the heat, and cook gently for 10 minutes.
Remove the pan from the heat and add the garam masala and chopped cilantro. Stir well and then leave the filling to cool before using to stuff the samosas.
Divide the samosa dough into 12 equal portions and roll out each one to a thin circle, 7 inches in diameter. Cut each circle in half with a sharp knife and then cover the semicircles with a damp cloth while you fill them one at a time.
Brush the edges of each semicircle with a little milk and spoon some filling on to the center. Fold in the corners, overlapping them to form a cone. Fold over and seal the top to make a triangle. Deep fry in hot oil in batches, until crisp and golden. Drain on paper towels and serve hot with chutney.