Preheat a sandwich press. Lightly spray the sweet potato with olive oil.
Cook the potatoes in the sandwich press for 8 to 10 minutes, turning halfway, or until just tender. Set aside to cool slightly then slice into 1cm thick fries.
Meanwhile, heat the oil in a large non-stick frypan over medium-high heat. Cook the onions for 2 to 3 minutes until softened.
Add the beef strips, cumin, garlic powder, and chilli powder. Cook for 5 minutes, stirring occasionally, until beef is browned and cooked through.
In a bowl, mash avocado with lemon juice and season with salt and pepper.
To serve, place sweet potatoes on a plate. Top with the beef mixture, avocado and tomato. Sprinkle with feta and green onions. Serve with sour cream and mixed salad.
PROVIDED BY AUSTRALIAN BEEF https://www.australianbeef.com.au/recipes/loaded-sweet-potato-fries-with-rump-strips/