Roast the Chillies and Garlic: Heat an iron skillet (tawa). Add your prepared green chillies and garlic cloves. Roast them until they develop slight blistered spots, then remove them from the heat.
Combine Ingredients: In a mixer jar (or a traditional mortar and pestle), add the roasted green chillies, garlic cloves, lightly roasted cumin seeds, and fresh coriander leaves.
Pulse, Do Not Puree: Pulse the mixer using an "on-off" motion just twice. You want a coarse texture, not a smooth paste.
Add Peanuts and Salt: Add the peanuts and salt to the coarsely crushed mixture. Pulse the mixer once again using the "on-off" method.
Heat Oil in the Skillet: In the same iron skillet used for roasting, heat 1-2 teaspoons of oil over a medium flame. (Optional: You can add finely chopped curry leaves and cumin seeds to the hot oil here).
Sauté the Kharda: Transfer the coarsely crushed chilli mixture into the hot skillet. Sauté on medium heat for about 2 minutes.
Add Lemon and Cool: Turn off the flame. If using, mix in the lemon juice now. Spread the mixture out in the skillet and let it cool down openly.