Taqueria Guacamole

2 ripe avocados
1 lemon, juiced
1 plum tomato, seeded and chopped
1 small white onion, finely chopped
1 medium fresh jalapeno, seeded and finely chopped
Coarse salt

Halve avocados lengthwise around pit. Remove pit with a large spoon, then scoop out flesh into a bowl. Squeeze the lemon juice into bowl. Add tomato, onion, and jalapeno. Mash guacamole with a fork to desired consistency. Season guacamole with salt, to taste.