Caramelized onions

1. 2 onions, thinly sliced
2. 2 tbsp (30 ml) olive oil
3. 1 tbsp (15 ml) red wine vinegar

Avocado relish

1. 2 avocados
2. 1/2 lemon, juice only
3. 1 tbsp (15 ml) olive oil
4. 1 tsp (5 ml) Dijon mustard
5. 1 green onion, finely chopped

Burgers

1. 1 lb (454 g) fresh tuna, finely chopped
2. Tabasco sauce, to taste
3. 4 hamburger buns
4. Boston lettuce leaves
5. Salt and pepper