If you haven't cooked the rice yet, rinse 1 cup of uncooked rice under cold water and cook it according to package instructions. Typically, this requires 1.5 cups of water for every cup of rice. Set aside after cooking.
Heat the olive oil in a large skillet or wok over medium heat. Add the cumin seeds and allow them to sizzle for about 30 seconds.
Add the chopped onion to the skillet. Sauté for about 5 minutes until the onion is translucent and slightly golden.
Stir in the minced garlic and sauté for an additional 1-2 minutes until fragrant.
Add the chopped spinach, turmeric powder, salt, and black pepper. Cook for about 3-4 minutes until the spinach wilts down and reduces in size.
Stir in the cooked rice and lemon juice, mixing well to combine all the ingredients. Cook for another 2-3 minutes to heat everything through.
Taste and adjust seasoning if necessary. Remove from heat.
Serve hot, garnished with chopped fresh herbs if desired.