Salmon Burgers

Ingredients

• 1 medium egg
• 1/2 cup / 125 ml whole wheat bread crumbs
• 1 tbsp / 15 ml ground flaxseed
• 2 cans (213 g each) salmon, drained
• 1/4 cup / 50 ml finely chopped onion
• 2 tbsp / 25 ml chopped fresh dill
• 2 tbsp / 25 ml lemon juice
• 1/4 tsp / 1 ml coarse sea salt, or to taste
• Freshly ground pepper, to taste
• 1 tbsp / 15 ml canola or grapeseed oil
• 2 6-inch (15 cm) whole wheat pita pockets, toasted and cut in half
• 2 tsp / 10 ml horseradish
• 1 cup / 250 ml baby spinach leaves
• 1 medium tomato, sliced