Slow Cooker Korean Beef Sliders with Cucumber Slaw

to 4 lb chuck roast

soy sauce

packed brown sugar

garlic, minced

fresh ginger, grated

rice vinegar

pure, dark sesame oil

olive oil

sriracha

water

of a hothouse cucumber, very thinly sliced

of a red onion, thinly sliced (I only had a yellow onion when I made this, a red onion tastes better in my opinion and makes for a much prettier slaw)

rice vinegar

to 2 teaspoons sugar

kosher salt

toasted sesame seeds

finely julienned daikon radish or jicama

finely julienned carrot

red pepper flakes