Curried Mushroom and Peas

Ingredients

• 2 tablespoons vegetable oil
• 1/2 teaspoon brown mustard seeds
• 1 cup red onion, thinly sliced
• 1 teaspoon ginger, finely grated
• 2 cups (12 ounces) mushrooms, sliced
• 1 cup frozen peas, thawed
• 1/2 teaspoon turmeric
• 1/2 teaspoon salt
• 1 teaspoon coriander powder
• 1/4 teaspoon cayenne pepper, or to taste
• 1/2 cup water
• 1/4 teaspoon garam masala
• 2 tablespoons slivered almonds, lightly roasted, optional