Soak 1 medium tomato-sized tamarind in 1/2 cup of hot water for 10 to 15 minutes.
Later, when it cools down a bit squeeze the soaked tamarind to a pulp. Strain and keep aside.
In a mortar and pestle, a coffee grinder, or a blender jar add garlic pods, coriander seeds, cumin, curry leaves, and black pepper. Crush or blend into a coarse mixture.
Heat 1/2 tbsp oil or ghee in a pan or kadhai over medium flame. When hot, add fenugreek seeds, mustard seeds, and cumin. Let them crackle.
Add dry red chilies, curry leaves, and asafoetida. Saute until leaves turn crisp.
Add the ground mixture. Saute for about 30 seconds or until you get a nice aroma.
Add the strained tamarind pulp along with 1.5 cups of water. Give a good mix.
Add turmeric powder and salt to taste. Mix well.
Let it come to a boil. Reduce the heat to low, add jaggery and let it simmer for 5 to 7 minutes. Check the taste and add salt, tamarind, or jaggery if necessary.
Add coriander leaves along with tender stems, switch off the stove and let it rest for 5 to 10 minutes.
Garlic Pepper Rasam is ready. Serve it hot with steamed rice and your choice of side dish.