For Best Results, gently massage Chimichurri Beef packages for 20 seconds prior to heating to separate meat into shreds. Empty contents of product into microwave safe dish and cover with paper towel. Microwave for 45 seconds stirring halfway. Let rest for 1 minute.
Heat the olive oil in a large frying pan, over medium heat and stir-fry the sliced onion and crushed garlic with the paprika, coriander, salt, lemon zest and pepper. Add the stock and tomato paste and simmer for 5 minutes with a lid on and 5 minutes with the lid removed.
Plate the mashed potatoes and pour the sauce over the top. Place shredded beef on top, and sprinkle with parsley to finish.