In a bowl, mix everything together. Let sit, refrigerated or in another bowl of ice, for 10-15 minutes. Stir and check for seasoning.
Place the salad in the middle of 4 serving plates and drizzle the cilantro vinaigrette around. Top salad with a mound of fish and fried tortilla crisps.
In a saute pan coated lightly with oil, saute the ginger and shallots for 2 to 3 minutes until lightly brown. Add the nopal and heat thoroughly. Season and add the vinaigrette. Place the greens in a large bowl and toss with warm vinaigrette. Check for flavor.
In a blender, add cilantro, garlic, syrup, Dijon, and juice, and blend at high speed. Slowly add the oil to emulsify and season with salt and pepper.
Beverage: Some Traditional Tequila/Beer Combo with lime