Make the filling: In a large bowl, combine the ground chicken, red onion, scallions, cilantro, garlic, ginger, turmeric, chili powder, garam masala, ghee, and olive oil. Mix well with your hands.
Place a tablespoon of filling in the middle of a dumpling wrapper. Using your finger, lightly wet the outer rim with water.
Pinch the top of the wrapper, using your fingers to pleat and tighten as you close so it looks like a little pouch. Repeat with the remaining wrappers and filling.
Bring a large pot filled a third of the way with water to boil over high heat and top with a dumpling steamer basket. Line the basket with cabbage leaves. Steam the momos in batches for 12-15 minutes, until the wrapper becomes slightly translucent.
Make the dipping sauce: In a medium saucepan, heat the olive oil over medium heat. Add the tomatoes, thai chilies, garlic, ginger, turmeric, and Szechuan peppers. Season with salt. Cook, stirring occasionally, until the tomato is softened, for 5 minutes. Remove the pan from the heat, and let cool for 5-10 minutes.
Transfer the tomato mixture to a blender and add the sesame seeds and cilantro. Blend until smooth.
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