Vegetarian Tamale Filling

• 2 onions
• 230 gr sharp cheddar cheese
• 230 gr swiss (shredded)
• 90 gr black olives (chopped)
• 90 gr pine nuts (chopped)
• 12 gr oregano (dried)
• 10 ml olive oil
• 4 gr cumin (ground)
• 1 package kernel corn (whole)
• some garlic