In a food processor pulse ginger and garlic then add onions and chilies. Melt butter and oil together over med heat. Add in onion mixture and curry powder, chili powder, lemon grass or zest, cinnamon and cardamom. Cook stirring often for 5 min or so. Add in chicken, tomatoes, peppers and salt. Bring to a furious boil. Reduce heat to med low or low to a simmer. 45 to 60 min.
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