In a Dutch oven, heat oil over medium-high heat. Add onion; cook and stir until tender, 4-5 minutes. Add garlic and shrimp; cook 1 minute longer. Stir in seasonings(msala jat). Add beer and lemon juice; bring to a boil. Reduce heat. Simmer, uncovered, until shrimp turn pink, 10-15 minutes. Stir in ketchup and parsley; discard bay leaf(taijh pat). Serve with rice.