Spray a non-stick pan with oil and heat on medium. Add the chopped onion, garlic, salt, pepper, and garlic powder. Cook until softened and golden.
Add the lean mince to the pan, breaking it up with a spoon. Cook until fully browned.
Just before serving, stir the cheese into the hot beef mixture until melted and creamy.
Add all the sauce ingredients to a jar, close the lid, and give it a good shake until smooth. Taste and adjust pickle juice or salt if needed.
Add the shredded lettuce to a large serving bowl.
Top the lettuce with the hot, cheesy beef, add sliced pickled cucumbers, drizzle with the yoghurt burger sauce, and sprinkle sesame seeds on top. Add extra cheese if you're feeling indulgent!
