-  2oz Maison No. 9

-  1.5oz Grapefruit Juice

-  0.5oz Lime Juice  

-  0.5oz Agave Syrup

-  0.75oz Tequila Blanco

-  2oz Soda Water

-  Ice

-  Salt (Optional for rim)

-  Grapefruit Wedge (Optional for garnish)

Add all ingredients except soda water into a shaker with ice.  Shake briefly.  Add 2oz of soda water to the shaker and strain over fresh ice into a salt-rimmed glass.  Garnish with a grapefruit wedge.