In a pan, add the butter along with the garlic and cook on low heat till the garlic starts to get a bit of colour. Do it on low heat to infuse maximum flavour.
Then add the shallots; sauté till softened.
Next add the tomatoes and cook on medium heat till the tomatoes are softened; mash lightly with the back of your spoon and mix well to combine.
Season with salt (taste before you add if you are using salted butter) and pepper.
Remove from heat and mix through the coriander leaves.