Rinse fresh spinach thoroughly to remove dirt and debris. Chop finely.
Soak rice and urad dal for 3–4 hours to soften them.
Blend soaked rice, dal, spinach, green chilies, and spices into a smooth batter.
Season the batter with salt, cumin, and other spices for flavor.
Heat a non-stick griddle or tawa over medium heat, lightly greased with oil.
Pour batter onto the griddle, spread it into a thin circle, and cook both sides.
Serve the crispy persattu with chutney or sambar for a nutritious, delicious meal.