Spicy beef samosa

Name: Spicy beef samosa
Ingredients: For dough:; 2 cups plain flour or maida; 4 tbsp. cooking oil; 1/2 tsp. salt; Water to make dough; For Filling:; 250 gm. mince meat of beef; 1 onion, peeled and finely chopped; 1/2 inch piece ginger, peeled and finely grated or chopped; 1 green chilli, finely chopped; 2 cloves garlic, peeled and grated or crushed; 1 tbsp. cooking oil; 1 tsp. coriander powder; 2 tsp. lemon juice; 1/2 tsp. garam masala; 1/4 tsp. chilli powder; to taste Salt; 1 handful coriander leaves, finely chopped; Oil for deep frying