Best-ever chunky guacamole

INGREDIENTS

• 1 large ripe tomato
• 3 avocados , very ripe but not bruised
• juice 1 large lime
• handful coriander , leaves and stalks chopped, plus a few leaves, roughly chopped, to serve
• 1 small red onion , finely chopped
• 1 chilli , red or green, deseeded and finely chopped
• tortilla chips , to serve