Slow Cooker Broccoli and Beef

sirloin steak, thinly sliced

low-sodium beef broth

low-sodium soy sauce

brown sugar

sweet onion, chopped

package dry onion soup mix

sesame oil

sriracha

garlic, minced

green onions, thinly sliced, plus more for garnish

cornstarch

broccoli florets

red pepper sliced, thin

Sesame seeds, for garnish

Cooked jasmine rice, for serving