Heat oil in medium pan. Sauté onions for 4-6 minutes until tender and lightly browned. Add garlic, spices, tomato paste (with a pinch of sugar). Stir and cook for 1 minute.
Add cherry tomatoes, chilli and water. Bring to boil. Then lower heat to simmer, stirring occasionally. The total time will be about 10 minutes, after 5 minutes, help burst tomatoes by gently pressing with spatula or large spoon to burst them.
Stir in sweet drop peppers and coriander. Continue cooking until tomatoes form a sauce the consistency you like. More cooking will make it thicker. Add more water to thin it out if needed. Taste and adjust seasonings e.g. more salt, sugar.