Toast the bread in a toaster oven, oven, or on a grill pan or skillet on the stove until desired level of toastiness.
2 slices sourdough bread
Meanwhile, slice open the avocado lengthwise and remove the pit. Scoop out the flesh with a spoon and place in a small mixing bowl. (Discard the pit and skin.)
1 avocado
Add a squeeze of lemon and sprinkle of salt, then coarsely mash the avocado with a fork. Taste and add more lemon juice and salt, if needed.
1-2 squeezes fresh lemon, salt
Use the fork to spread the avocado mixture on the slices of toast.
Top with cherry tomato halves and serve immediately.