Get your ingredients ready.
Cut paneer and onion into cubes, rectangles or triangles. The choice of paneer cut is yours.
Take paneer & onion cubes in a large mixing bowl, and marinate with chopped green chilli, black pepper powder, chilli flakes, salt and lemon juice. Mix it well and keep it aside for 15 min.
Heat a non-stick pan on medium flame, drizzle 1 tsp of olive oil and place the paneer and onion cubes on the pan.
Cook on one side till light golden brown and then flip it to cook on the other side till light brown.
Remove from flame and garnish with some chopped coriander leaves.
Paneer kali mirch is ready to be served.