Large batches can be mixed in advance of serving. Mix all together, keeping ice separate. Store in a large mason jar or beverage container with resealable lid. Refrigerate until ready to serve.
When ready to serve, fill glasses with ice and pour. Enjoy right away while cold.
Instructions for Blended / Frozen:
To a blender, add 1 1/2 c. ice, tequila, Cointreau, lime juice and grenadine. Blend until smooth. Pour into salted (if desired) margarita glasses and enjoy right away while cold.