Chimichurri has a fresh herby, garlicky, tangy taste, a bit like a vinaigrette with a kick. The herby flavor comes from the use of parsley and oregano while the chili gives the sauce its kick. It is, however, not too spicy. The garlic gives the sauce a slightly pungent note, without being too overbearing. You can reduce the bitter taste by adding a sweetener such as sugar, sugar-free low-carb sweeteners, or coconut sugar. You can also use more of the other ingredients such as garlic and chili, to make them stand out more.