"Bring the heat...."
vegetable oil, divided
small yellow onion, diced
cloves garlic, minced
freshly minced ginger
green chilis, one diced and one sliced in rounds, divided
cumin seeds, divided
coriander
turmeric
paprika
cinnamon
red lentils
(14-oz.) can diced tomatoes
low-sodium vegetable broth
Kosher salt
Freshly ground black pepper
Yogurt, for serving