In a food processor, combine the olive oil, lemon juice, sherry vinegar if using, grated garlic, cumin, coriander, dried oregano, smoked paprika, turmeric, allspice, kosher salt, black pepper, scallion whites, and cilantro. The marinade should smell deeply fragrant and spiced. Taste it. It should be well seasoned and bold enough to stand up to three pounds of chicken.
4 scallions, 1 tbsp ground cumin, 1 tsp ground coriander, ½ tbsp dried oregano, 1.5 tbsp pimenton de la Vera or smoked paprika, 1 tsp ground turmeric, ¼ tsp ground allspice, 1.5 tbsp kosher salt, ¼ cup extra virgin olive oil, 3 tbsp fresh lemon juice, 2 tbsp sherry vinegar, 5 garlic cloves, A few grinds of black pepper, ¼ cup fresh cilantro