Make the Coarse Paste: In a mixer jar, add the green chillies, garlic, ginger, soaked chana dal, ajwain, and cumin seeds. Pulse it into a coarse mixture without adding any water.
Mix the Dry Ingredients: Transfer the coarse paste into a large mixing bowl. Add the jowar flour, chopped spinach (palak), dill leaves (shepu), chopped curry leaves, sesame seeds, turmeric, hing, salt, and fresh coriander.
Knead the Dough: Squeeze in the lemon juice. Mix everything really well with your hands first. Because the leafy greens have natural moisture, do not add water immediately. Gradually sprinkle a little water only if needed to form a stiff dough.
Shape the Vadi Rolls: Divide the dough and shape them into medium-thick cylindrical rolls (logs).
Steam the Rolls: Grease a steamer plate with a little oil. Place the rolls on the plate, cover the steamer, and cook on low-medium heat for 10 to 12 minutes.
Cool and Slice: Once steamed, remove the rolls and let them cool down completely. Cut them into slightly thick slices (vadis).
Fry to Perfection: Heat oil in a pan. Carefully drop the sliced vadis into the hot oil and fry them until they are crispy and golden brown on both sides.
Serve Hot: Remove them onto a paper towel to drain excess oil. Serve your crispy Palak Shepu Vadi immediately!