PreparationPlace all ingredients, except 3/4 c oil, cilantro, mayo and water in food processor. Blend to combine, then add cilantro 1 bunch at a time blending well. Add final 3/4 c oil while blending. In large stainless steel bowl, whisk together mayonnaise and water until smooth. Add blended ingredients and mix well. Arrange romaine lettuce on a plate, ladle dressing over lettuce and top with diced tomatoes, crumbled Cotijo cheese and pepitas. (try not to lick the bowl clean) *broil on low on a wire rack about 6 minutes each side, or until skin blisters. Remove and allow to cool. Peel off skin, scrape out seeds.