Mujaddara with Spiced Yogurt

INGREDIENTS

• 6 cups onions (about 3 medium onions), halved and thinly sliced
• 3/4 cups Puy lentils (aka French lentils, the tiny dark brown ones)
• 1/4 teaspoon salt
• 1/2 cup Greek yogurt
• 2 tablespoons butter
• 3 tablespoons chopped fresh mint
• 3 tablespoons olive oil
• 1 cup jasmine rice
• Juice and zest of half a lemon
• 1/2 teaspoon coriander (freshly ground)
• 1/2 teaspoon cinnamon
• 1/2 teaspoon cumin (freshly ground, if possible)
• 1/2 teaspoon spicy paprika or aleppo pepper
• 1 teaspoon salt, divided