Here's the recipe as found at delish.com
8 ounce(s) sirloin steak, trimmed of fat and cut into 1-inch chunks
1 teaspoon(s) fennel seed, roughly chopped or coarsely ground in a spice grinder
1/2 teaspoon(s) kosher salt, divided
1 tablespoon(s) extra-virgin olive oil
1 tablespoon(s) minced garlic
3/4 cup(s) reduced-sodium beef broth, divided
1/4 cup(s) dry red wine
2 bell peppers, cut into 1-inch squares
Freshly ground pepper , to taste
1 tablespoon(s) all-purpose flour
Rub steak with fennel seed and 1/4 teaspoon salt, turning to coat on all sides. Heat oil in a large skillet over medium-high heat. Add the steak in a single layer and cook, turning once, until browned on the outside and still pink in the middle, 2 to 4 minutes. Transfer to a plate and cover with foil to keep warm.
Add garlic to the pan and cook, stirring constantly, until fragrant, about 30 seconds. Add 1/2 cup broth and wine, scraping up any browned bits with a wooden spoon. Add bell peppers, the remaining 1/4 teaspoon salt and pepper; bring to a simmer. Cover, reduce heat to maintain a simmer and cook until the peppers are tender-crisp, 4 to 6 minutes.
Whisk the remaining 1/4 cup broth and flour in a small bowl. Add to the pepper mixture, increase heat to medium-high and bring to a simmer, stirring constantly. Return the steak to the pan. Adjust heat to maintain a slow simmer and cook, turning the meat once, about 2 minutes for medium-rare.
The only change I made to this was adding about 1 cup of sliced mushrooms. This recipe was very simple, provided opportunity for teamwork (thanks for doing the prep, honey!) and was raved about with every bite. Even on the second day after for leftovers.