curried cauliflower and potatoes (aloo gobi)

Ingredients

• 2 - hot green chili peppers, minced
• 1 - 1/2-inch piece of ginger root
• 1 tablespoon cumin seed
• 1 tablespoon black mustard seeds
• 4 tablespoons ghee or 4 tablespoons oil
• 3 medium potatoes, diced
• 1 medium cauliflower, cut into florets
• 2 medium tomatoes, diced
• 1/2 teaspoon turmeric
• 2 teaspoons coriander
• 1/2 teaspoon garam masala
• 1 tablespoon brown sugar, optional
• 1 teaspoon salt
• 3 tablespoons coriander, coarsely chopped (cilantro)