Put the cilantro, cardamom, cumin, garlic, jalapeno and lemon juice in a blender and puree until smooth. Transfer the mixture to a medium bowl, stir in the yogurt and season with salt and pepper.
Spoon the dip into a serving bowl and drizzle with the olive oil if using. Garnish with cilantro. Serve with grilled flatbread and/or cut-up vegetables for dipping.
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