Indian Masala Dosa

Name: Indian Masala Dosa
Cuisine: Asian, Indian
Ingredients: For Dosa Batter; 1 cup rice; ½ cup urad dal (split black gram); ½ teaspoon fenugreek seeds; Salt, to taste; Water, as needed for soaking and blending; 3 medium potatoes, boiled and mashed; 1 medium onion, thinly sliced; 2 green chilies, chopped; 1 teaspoon mustard seeds; 8-10 curry leaves; ½ teaspoon turmeric powder; 1 tablespoon oil; Salt, to taste; Fresh coriander leaves, for garnish