Start by rinsing the shrimp under cold water. Pat them dry with paper towels and season with salt.
In a large skillet or wok, heat the oil over medium heat until hot but not smoking.
Add the curry leaves and chopped birds eye chilies. Sauté for about a minute until fragrant.
Add the finely chopped shallots and garlic. Stir-fry for 2-3 minutes until shallots are translucent.
Add the seasoned shrimp and cook for about 3-4 minutes until they turn pink and opaque.
Sprinkle in the turmeric powder and sugar, stirring well to combine.
Add the tamarind concentrate, stirring to coat the shrimp evenly. Cook for another minute.
Remove from heat and transfer to a serving dish. Serve warm with steamed rice or naan.