• Heat oil in a pan, saute the shrimps until these change in color or turn orange. Then take these out of the pan.

For the Spicy Garlic Shrimp Sauce

• In the same pan, melt butter and saute garlic for a minute. Mix in chillies, oyster sauce, and ketchup. Pour in calamansi and black pepper to taste. Stir until well combined.
• Mix in sugar. Cook until the sauce has reduced slightly and thickened. Add back the shrimps and toss until these are well coated with the sauce.
• Cover and cook for a minute. Garnish with parsley before serving.