Toast your bread until nice and golden, just to your liking.
Meanwhile, in a small bowl place the avocado together with a squeeze of fresh lemon juice, and mash it with a fork.
Season with sea salt and pepper to your taste.
Top toasted bread with mashed avocado mixture, then top it with cherry tomatoes, shredded cheese and jalapeño slices.
Broil for 3-4 minutes, or until cheese is melted. Watch it closely! Goes from almost there to burnt...fast!