Step 1: Make the Dough : In a large bowl, combine flour, salt, and oil. Rub the mixture between your palms until crumbly. Add a little water at a time and knead until firm but pliable. Cover and rest.
Step 2: Cook the Filling : Heat oil in a skillet. Add onions, garlic, and ginger. Sauté until translucent. Add chicken and spices. Stir well and cook until all moisture evaporates. Finish with cilantro and lemon juice. Let it cool.
Step 3: Shape the Samosas : Divide dough into balls, roll each into thin ovals, and cut in half. Form a cone by sealing the straight edge with water, fill with chicken mixture, then seal the top tightly.
Step 4: Fry the Samosas : Heat oil to medium temperature. Fry samosas in batches until golden brown and crisp. Avoid overcrowding the pan.
Step 5: Prepare the Chutney : Blend cilantro, mint, green chili, garlic, lemon juice, yogurt, and salt until smooth. Chill before serving.