Classic Guacamole

Ingredients

• ¼ red onion, finely chopped
• Juice of 1 lime, divided
• 2 ripe tomatoes—halved, deseeded and finely chopped
• 2 ripe avocados, peeled and pitted
• ½ ounce (15g) cilantro, finely chopped
• 1 green serrano or jalapeño pepper, deseeded and finely chopped
• Fine sea salt, to taste