Grate the onion, then squeeze it very hard and discard all the juice (the juice will make the patties fall apart). Peel and grate the potatoes as well.
Mix the grated onion and grated potato with the ground beef.
Add the egg, flour and spices. Using your hand, mix everything until well combined. The mixture will be very sticky.
Heat the oil in a shallow pan over medium heat.
Keep a bowl of water nearby. Wet your hands, take about 2 tablespoons of the mixture, form into an oval patty and fry about 5 minutes per side until browned and cooked through.
Serve warm with sliced tomatoes, fries and pickles, or tuck into sandwiches with herbs.
Persian beef and potato patties, pan-fried crispy. Every Iranian home has its own version. Shadi's maman made kotlet sandwiches with pickles, herbs and tomatoes. From unicornsinthekitchen on Instagram; full recipe at unicornsinthekitchen.com.