Quinoa and Salmon Casserole

Ingredients

• 2 tablespoons olive oil (divided)
• 1 cup red onion (finely chopped)
• 1 cup fennel (bulb and some fronds) (finely chopped)
• 2 cups water
• 1/2 teaspoon salt (plus more to taste)
• 1 cup quinoa (well washed and drained)
• 2 (14.5-ounce) cans diced tomatoes (preferably fire-roasted, undrained)
• 1 pound salmon fillets (skin removed, cut into 1-inch chunks)
• 1/4 cup packed fresh dill (chopped)
• 1 tablespoon fresh lemon juice
• 1 lemon (zested)
• lemon wedges (garnish)