1Begin by finely chopping the large onion and mincing the garlic cloves.
Heat a large pan over medium-high heat and add the minced meat. Cook until browned, breaking it apart with a spatula.
Add the chopped onion and minced garlic to the pan. Stir well and cook until the onion becomes translucent.
Stir in the frozen vegetables and continue to cook for about 5 minutes, or until the vegetables are heated through.
Slice the cucumber into thin rounds and set aside.
Season the stir-fry with black pepper, adjusting to taste.
Serve the spicy minced meat stir-fry hot, garnished with the sliced cucumber on the side.