First, heat a pan or tawa on medium heat and dry roast the garlic cloves until they develop slight brown spots. This helps the thecha last longer.
Add the light green and dark green chillies to the pan and roast them along with the garlic.
Add 1 teaspoon of cumin seeds to the pan and roast everything together for about 1 minute.
Turn off the heat, let the mixture cool slightly, and transfer it to a mixer jar.
Add salt to the mixer jar. Adding a bit of extra salt balances the heat and acts as a preservative for this green chilli thecha recipe.
Pulse the mixer to grind the ingredients into a coarse paste. Do not make a fine paste; a chunky texture is traditional.
Heat 1 1/2 tablespoons of oil in the same pan. Add the chopped onion and sauté until it turns light golden brown.
Add the coarsely ground chilli-garlic mixture to the pan and sauté continuously on a medium flame.
Stir in the chopped coriander leaves and mix well.
Finally, add the coarsely crushed roasted peanuts and sauté for 1 more minute on a medium flame. Turn off the heat, and your delicious thecha is ready!