Measure and rinse: Rinse 1 1/2 cups dry brown lentils under cold water and pick out any small stones or debris. Rinsing removes dust and ensures even cooking.

Prep aromatics and liquids: Finely chop 1 large onion, mince 4 garlic cloves and grate 1 1/2 tablespoons fresh ginger. Open the canned diced tomatoes and the light coconut milk. Having these ready keeps the cooking process smooth and prevents burning the aromatics.

Toast the rice for nuttiness: In a medium saucepan, heat 1 teaspoon oil over medium heat. Add the rinsed 1 cup brown rice and toast, stirring, until grains are fragrant and slightly opaque (about 2–3 minutes). Toasting develops a deeper nutty flavor and helps the grains stay separate. Add 2 cups water and a pinch of salt, bring to a gentle boil, then reduce heat to low, cover tightly and simmer for 40–45 minutes (or until water is absorbed). Remove from heat and let rest, covered, for 10 minutes before fluffing with a fork.

Bloom the spices: Meanwhile, heat 2 tablespoons vegetable oil in a large wide pot or Dutch oven over medium heat. When the oil shimmers, add the chopped onion and a 1/2 teaspoon salt. Cook, stirring occasionally, until the onion is soft and just beginning to brown at the edges (6–8 minutes). Browning the onion adds sweetness and depth.

Add garlic, ginger and curry powder: Add the minced garlic, grated ginger, 2 tablespoons curry powder and 1 teaspoon ground cumin. Stir constantly and cook for 30–45 seconds until aromatic. Toasting the spices in oil 'blooms' their volatile oils and magnifies their flavor—don’t skip this, but be careful not to burn the garlic.

Add tomatoes and reduce: Pour in the 14 oz can diced tomatoes with their juices. Stir, scraping up any browned bits from the bottom of the pot. Simmer for 3–4 minutes to evaporate some raw tomato edge; this concentrates flavor and integrates the spice paste with the tomato base.

Add lentils and liquid: Add the rinsed lentils and 3 cups vegetable broth or water. Stir and bring the mixture to a gentle boil, then lower heat to maintain a simmer. Partially cover and cook for 20–25 minutes, stirring occasionally, until the lentils are tender but not mushy. Brown lentils hold their shape—cook until you can mash a few with the back of a spoon for creaminess while others remain intact.

Finish with coconut milk and spinach: Once the lentils are nearly tender, stir in the 1 can light coconut milk and chopped spinach. Simmer uncovered for another 5–7 minutes—the coconut milk adds silk and richness while the spinach wilts and brightens the dish. If the curry looks too thin, simmer a few extra minutes to reduce; if it’s too thick, add a splash of water.

Season and balance: Taste and season with the remaining salt (about 1 teaspoon more if needed) and 1/2 teaspoon freshly ground black pepper. Stir in 1 tablespoon fresh lemon juice to lift the flavors—the acid brightens the coconut and tomato.

Serve: Fluff the toasted brown rice and spoon it into shallow bowls. Ladle the lentil and spinach curry over the rice. Garnish with chopped cilantro and a drizzle of coconut milk if you like. Serve hot.