Heat 2 tbsp oil in a medium non-stick pan. Place the paneer pieces and cook until browned, around 2 minutes. Turn over, brown the other side (around a minute) and remove from heat and set aside on paper towels. Cut the slabs into half, so they are bite size pieces.
Add 1 tsps oil to the remaining oil in the pan. Add the garlic, ginger and chillies. Cook for 2 minutes and add the onions. Saute over high heat until the onions soften and brown. Add soy sauce, coriander powder, lemon juice and let simmer for 2 minutes.
Add ketchup. Mix well and let simmer for 5 minutes. Add the fried paneer pieces coat well, sprinkle with cilantro on top and serve.
The soy sauce and ketchup add enough salt to this dish, no extra salt is needed.