Wash and cut 2 small cucumbers into rough pieces. Keep them aside.
In a mixer jar, add 1 cup cucumber, 1 tsp cumin seeds, 2 green chilies, 1-inch ginger, 4-5 garlic cloves, and ½ cup coriander leaves. Grind into a smooth paste without adding water.
Now, transfer the ground paste into a mixing bowl. Add 1 cup rava, 2 tbsp gram flour (besan), 2 tbsp rice flour, ½ cup curd, and salt to taste. Mix well.
Then, add ½ cup water and mix until the batter reaches a medium-thick, ribbon-like pouring consistency.
Now, add 1 tbsp oil and whisk the batter for 2-3 minutes to make it light and fluffy. Cover and let it rest for 10-15 minutes.
After some time, the rava will puff up, and the dhokla batter will be ready. Add 1 tsp eno and 1 tsp lemon juice. Mix well until the batter becomes light and fluffy.
Grease a plate with oil and spread a thin layer of the batter on it. Sprinkle some red chili powder and black pepper powder on top.
In a steamer, add 3-4 cups of water and bring it to a boil.
Place the dhokla plate in the center, cover it with a lid, and steam on medium-high flame for 12-15 minutes.
Once done, remove the plate from the steamer and allow it to cool for 5-10 minutes.
Now, in a tadka pan, add 1 tbsp oil, ½ tsp mustard seeds, 1 tsp sesame seeds, a pinch of hing, some curry leaves, and 2 chopped green chilies. Sauté.
Pour the tempering over the steamed dhokla and spread it evenly. Cut the dhokla into desired shapes.
Serve the instant dhokla with oil and garlic chutney.