In a medium skillet add the granulated sugar and spread into an even layer. Heat the skillet to medium-high heat. As the skillet starts to heat, begin to swirl the skillet making sure the sugar does not burn. Whatever you do don’t whisk the sugar. Just keeping swirling until the sugar is golden brown about two to three minutes.
Next, add in the 1/3 cup water. Careful it will be hot and will sizzle. Keep swirling the pan once you’ve add the water for about 30 seconds.
Stir in the fish sauce, garlic, ginger, coriander, cumin, and pepper. Once combined remove the skillet from the heat and set aside.
Meanwhile, thread beef onto a few skewers. With 2 lbs of beef cubes I got about 5 skewers threaded. Cover the skewers with olive oil.
Heat a grill pan to high heat and then grill the skewers for about five to six minutes turning to make sure all the meat is evenly browned.
Remove the skewers from the grill and place on a platter. Drizzle the tops of the skewers with the sauce and garnish with lime wedges, jalapeno rounds, and radish slices!