Follow these detailed steps carefully to achieve perfectly shaped, crispy, and flavourful samosas every time. We will break the process down into three manageable stages: creating the dough, preparing the filling, and finally, assembling and frying your mini samosas to golden perfection.

Part 1: Making the Samosa Dough

1. Combine Dry Ingredients: In a large mixing bowl, combine the all-purpose flour, salt, and ajwain (carom seeds). Whisk them together to ensure they are evenly distributed.
2. Incorporate the Fat: Add the melted ghee or oil to the flour mixture. Using your fingertips, rub the fat into the flour. Continue this process until the mixture resembles coarse breadcrumbs. To check if you’ve done it right, take a small amount in your fist and press it. It should hold its shape. This step is crucial for a flaky crust.
3. Knead the Dough: Gradually add the cold water, a little at a time, and begin to bring the mixture together. You are looking to form a stiff, firm dough. Do not over-knead. Just knead for about 5-7 minutes until it comes together and is relatively smooth. It should be firmer than a standard chapati or bread dough.
4. Rest the Dough: Cover the dough with a damp kitchen towel or plastic wrap and set it aside to rest for at least 30 minutes. This resting period allows the gluten to relax, making the dough easier to roll out and preventing it from shrinking back.

Part 2: Preparing the Spicy Vegetable Filling

1. Toast the Spices: Heat 2 tablespoons of oil in a large pan or skillet over medium heat. Once the oil is hot, add the cumin seeds and let them sizzle and become fragrant for about 30 seconds.
2. Sauté Aromatics: Add the finely chopped onion, grated ginger, and green chilies. Sauté for 2-3 minutes until the onions become soft and translucent.
3. Cook the Vegetables: Add the finely diced carrots and green peas to the pan. Cook for 4-5 minutes until the carrots are tender-crisp. If using frozen peas, they will cook a bit faster.
4. Add the Spices: Stir in the turmeric powder, coriander powder, and red chili powder. Cook for another minute, stirring continuously, until the raw smell of the spices disappears.
5. Combine Everything: Add the roughly mashed potatoes to the pan. Mix everything together gently, breaking up any large potato lumps. Be careful not to mash the mixture into a complete paste; you want some texture.
6. Final Seasoning: Sprinkle in the garam masala, amchur (dry mango powder), and salt to taste. Give it one final, thorough mix. Turn off the heat and stir in the freshly chopped cilantro.
7. Cool the Filling: Transfer the filling to a plate or bowl and spread it out. Allow it to cool down completely to room temperature. Using a hot filling will make the pastry soggy and difficult to seal.

Part 3: Assembling and Frying the Mini Samosas

1. Divide the Dough: After the dough has rested, give it a quick knead for a minute. Divide the dough into 8-10 equal-sized small balls. Keep the balls covered with a damp cloth to prevent them from drying out.
2. Roll the Pastry: Take one ball of dough and place it on a clean, flat surface. Roll it out into a thin oval or circle, about 4-5 inches in diameter. The thickness should be even throughout.
3. Cut and Shape: Using a sharp knife, cut the rolled-out oval in half, creating two semi-circles.
4. Form the Cone: Take one semi-circle. Apply a little water along the straight edge with your fingertip. Bring the two corners of the straight edge together to overlap slightly, forming a cone shape. Press the seam firmly to seal it completely.
5. Fill the Samosa: Hold the cone in your hand and carefully spoon about 1 to 1.5 tablespoons of the cooled vegetable filling inside. Do not overfill, as this can cause the samosa to burst while frying.
6. Seal the Samosa: Apply a little more water to the inner rim of the cone’s open edge. Pinch the top edges together firmly to seal the samosa completely. You can also create a small pleat on one side before sealing to help the samosa sit upright. Place the assembled samosa on a plate and cover it with a cloth. Repeat this process with the remaining dough and filling.
7. Heat the Oil: Pour enough oil for deep-frying into a heavy-bottomed pan or kadai. Heat the oil over low to medium-low heat. The temperature is critical. To test if it’s ready, drop a tiny piece of dough into the oil. It should sink to the bottom and then rise slowly to the surface with gentle bubbles. If it rises too quickly, the oil is too hot.
8. Fry the Samosas: Carefully slide 3-4 mini samosas into the oil at a time, depending on the size of your pan. Do not overcrowd it. Fry on low heat for 10-15 minutes, turning them occasionally, until they are firm, crisp, and a beautiful deep golden brown. Frying on low heat is the secret to a perfectly cooked, non-greasy, and blistered crust.
9. Drain and Serve: Once fried to perfection, remove the samosas with a slotted spoon and place them on a wire rack or a plate lined with paper towels to drain any excess oil. Serve hot with your favourite chutneys.