1 large onion, finely chopped
2 tablespoons vegetable or canola oil
About 1/2 tsp. salt
4 garlic cloves, minced
One 2-in. piece ginger, peeled and finely shredded into a mush
4 green onions, chopped
1 jalapeño chile, seeded and finely chopped
2 teaspoons ground coriander
1/4 teaspoon cayenne
1/4 cup plain whole-milk yogurt
1 can (15 oz.) chopped tomatoes
2 teaspoons garam masala (see Notes)
6 hard-cooked eggs, halved lengthwise
1/4 cup chopped cilantro (optional)