01 -
Trim any visible fat from your steak and slice it paper-thin against the grain. This is crucial for tender, easy-to-chew meat that won't be chewy.
02 -
Heat 1 teaspoon of oil in a large skillet over medium-high heat. Add the sliced steak and cook for 3-5 minutes, stirring occasionally, until nicely browned. Remove steak to a plate and set aside.
03 -
While the steak cooks, slice your bread lengthwise and toast both halves under the broiler until golden. Keep them warm and set aside for assembly.
04 -
Add remaining oil to the same pan (don't clean it - those browned bits add flavor!). Toss in onions and peppers, cooking over high heat for about 5 minutes until they're softened and starting to char at the edges.
05 -
Dissolve the bouillon cube in hot water until completely smooth. Pour this mixture and Worcestershire sauce into the pan with vegetables. Let it bubble vigorously for 1-2 minutes until most liquid evaporates, then remove from heat.
06 -
Place bottom halves of toasted bread on a baking sheet. Layer with the vegetable mixture, then the cooked steak, and top with cheese. Sprinkle with red pepper flakes if desired. Broil 3-5 minutes until cheese melts and bubbles. Crown with top halves and serve immediately.