Using a blending wand/stick or blender puree the cilantro, oil, garlic, paprika, red chili flakes and 1/2 of the lemon juice until smooth.
In a large skillet, heat oil over medium-high heat. Carefully add the potatoes to skillet, and pan fry for about 15 minutes or until golden brown, turning often.
Turn heat to low and pour half of the cilantro sauce over cooked potatoes. Toss to coat and cook several minutes.
Transfer potatoes to a serving dish. Garnish with remaining cilantro sauce, fresh cilantro leaves (optional), and squeeze remaining half of lemon juice over the potatoes before serving.