Spicy Beef Tostadas

Yield: 6 Servings
Categories: Mexican, Beef
1lbBeef flank steak
Nonstick spray coating
6Flour tortillas (7-inch)
1cSalsa
1tsCornstarch
1/2tsInstant beef bouillon granules
1mdZucchini, cut into thin strips (2 cups)
4Green onions, bias cut into 1-inch lengths
1tbCooking oil
1/2cMonterey Jack cheese, shredded (2 oz)
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