Cut the meat into bite-sized pieces and slice the onion.
Heat the oil in a pan over medium heat. Cook the onion and minced garlic for 3-4 minutes until softened.
Add the meat and cook for 4-5 minutes until browned on all sides.
Stir in the curry powder and cook for 1 minute.
Pour in the coconut milk and 250 ml water. Bring to a boil over medium-high heat, then reduce heat to medium-low and simmer for 15-20 minutes until the meat is tender. If using chicken, cook until the internal temperature reaches 74 °C / 165 °F.
Season with salt and pepper to taste and garnish with the chopped coriander.