2 tablespoons vegetable oil
1-pound beef sirloin, cut into 2-inch strips
1 red bell pepper, cut into strips
1 yellow bell pepper, cut into strips
1 green bell pepper, cut into strips
2 baby marrow’s, thinly sliced into strips
12 Green beans Trimmed/Snapped and cut in half.
2 carrots, thinly sliced into strips
1 white onion, julienne cut.
2 tablespoons soy sauce
Heat vegetable oil in a large wok or skillet over medium-high heat; cook and stir beef until browned, 3 to 4 minutes. Move beef to the side of the wok and add baby marrow, bell peppers, green beans, carrots, white onion. Cook and stir vegetables for 2 minutes.
Stir beef into vegetables and season with soy sauce. Continue to cook and stir until vegetables are tender, about 2 more minutes.