Palong shak-er dalna(bengali spinch, peas & potato curry)

Ingredients

Spinach :

• Potato(medium) : 2 (cut into small cubes)
• Green peas(fresh or frozen) : 1/3 cup (optional, only if available)
• Onion : 1(medium)
• Garlic cloves : 2(grated)
• Ginger : 1" piece(finely chopped)
• Green chilli : 2(finely chopped)
• Dry red chilli : 1
• Turmeric powder : 1 teaspoon.
• Chilli powder : 1 teaspoon.(optional)
• Black Cumin seed(kalonji) : 1 teaspoon.
• salt to taste
• Oil : 1 tablespoon.