Prepare Cucumber Cups

1. Peel the cucumbers and cut into 3/4" to 1"
2. Using a melon ball scoop, form a cavity in the cucumber slices

Prepare the Nuoc Chom

1. Combine Nuoc Chom ingredients and stir until sugar is dissolved

Prepare the Marinade

1. Combine marinade ingredients and pour marinade over beef
2. Marinate for 30 minutes

Grill the Beef

1. Grill flank steak over medium heat to an internal temperature of 120 degrees (medium rare)
2. Allow meat to cool.  Once chilled, chop meat to ¼" dice and combine with Nuoc Chom

Assemble

1. Fill cucumber cups with Thai beef mixture
2. Garnish with shaved scallion or cilantro leaf