Place approximately 3/4 cup hot rice on each plate.
Spoon approximately 3/4 cup hot lentils over rice.
Top with approximately 2 tablespoons diced onions, 1/4 cup diced tomato, 1/2 cup finely diced cucumber, 1/4 cup sliced olives, and 1/4 (or more) sliced avocado.
Top with a generous dollop of sour cream.
Serve immediately.
Notes
Mazidra is best with lentils that are a little saucy but not too soupy. If your lentils are soupy, you may want to drain them a little.