In a dry pan on medium heat, sweat the Cinnamon Stick, Peppercorns, Coriander Seeds, Black Cardamom Pods, Cloves and Cumin Seeds for 10 minutes until fragrant, stirring frequently.
Put the butter in a saucepan. Add the Onion, Garlic, Ginger, Fenugreek, Oregano, Turmeric, Nutmeg.
Add the sweated whole spices and cook for 2 hours on medium heat.
Strain the butter through several layers of cheesecloth.
Put into a pint jar. Let cool, cover and keep refrigerated.