Spiced Sweet Potato and Rutabaga Gratin

Ingredients

• rutabaga

  peeled and cut into ¼-inch slices (2½ to 3 cups)
  ½ medium
• carrots

  sliced diagonally
  2 medium
• sweet potatoes

  peeled, sliced into ¼-inch slices and kept in cold water until ready to use
  2 large
• vegetable oil
  3 tbsp
• onion

  chopped
  1 medium
• garlic

  minced
  3 cloves
• -inch piece fresh ginger

  chopped or grated
  1 unit
• turmeric
  1 tsp
• coriander seeds

  lightly crushed
  1 tsp
• cumin seeds

  lightly crushed
  3 tsp
• fresh lemon juice
  2 tsp
• sunflower seeds
  ⅓ cup