Jazzed-up Mexican cheeseburgers with avocado salsa

Ingredients

• 1 egg
• 1/4 tsp chunky salsa , well drained
• 1 tsp ground cumin
• 1/2 tsp salt
• 1/2 tsp cayenne pepper
• 1/4 tsp freshly ground black pepper
• 500 g ground beef
• 1 to 1 1/2 cups shredded Mexican- or Italian-flavoured cheese , or fontina
• 1/4 cup fine dry or store-bought bread crumbs
• 1 small ripe avocado
• 1 medium tomato
• 1/2 cup chunky salsa