Chop the onion and garlic in a food processor or a blender with a bowl. Transfer to a deep pan and quickly sauté in any vegetable oil. Once the onion becomes translucent, add sugar, salt, lemon juice, and spices, and cook for another 5 minutes. Then pour in the balsamic vinegar, mix well, and let it reduce. Balance the flavour with extra sugar, salt, and lemon juice if needed. Simmer a few more minutes until the marmalade thickens.

Let it cool and serve with any pâté, cheeses, or as a savoury spread for toast.