Preheat oven to 350 degrees. Line 3 mini loaf pans or 1 standard loaf pan with parchment, leaving a 2-inch overhang; brush with oil. Heat oil in a large saucepan over medium-high heat. Add rice, lentils, onion, and curry powder. Cook, stirring, until fragrant and toasted, about 3 minutes. Add water; bring to a boil. Reduce heat to low, cover, and simmer until water is absorbed and lentils and rice are al dente, 12 to 15 minutes. Remove from heat.

Stir in remaining ingredients. Transfer to pans; bake until tops are golden brown and firm, about 1 hour. Let cool at least 10 minutes.