1 lb sirloin steak, thin strips
                 1 1/2 ts chili powder
                   3/4 ts salt
                   3/4 ts pepper
                     2 tb vegetable oil
                     1    onion, in strips
                     4    garlic cloves, minced
                     1 ts ground cumin
                     1 pn hot pepper flakes
                     1    sweet red pepper
                     1    sweet yellow pepper
                     1    sweet green pepper
                     1    zucchini
                     1 ts dijon mustard
                     2 tb fresh coriander, chopped
                     1    10-inch flour tortillas
                     2    avocados
                   1/3 c  lime juice

                 Thinly slice red, green and yellow sweet pepper.
                 Cut zucchini lengthwise then slice.

                 In bowl, toss steak with chili powder and
                 1/4 ts each of the salt and pepper.

                 In large nonstick skillet, heat 1 tb of the oil
                 over medium-high heat; cook steak, in 2 batches,
                 stirring, for 2-1/2 minutes or until browned.
                 Transfer to plate; set aside.

                 In same skillet, heat remaining oil; cook onion,
                 half of the garlic, 1/4 ts cumin and hot pepper
                 flakes for 3 minutes. Add sweet peppers
                 and zucchini; cook, stirring, for 3 minutes or
                 until tender-crisp.

                 Return meat to skillet; toss gently, adding
                 mustard and coriander.

                 Meanwhile, wrap tortillas in foil; heat in
                 350F 180C oven for 5 minutes or until warmed
                 through.

                 Peel and pit avocados; mash with lime juice
                 and remaining garlic, salt and pepper.

                 Spread 2 tb of avocado mixture over tortillas.
                 Divide beef mixture among tortillas and roll up.
                 Serve with remaining avocado mixture.