(Claw crab meat can be a cheaper alternative to lump crab meat. Use either one but make sure to check the meat for possible bits of shell before cooking.)
Heat up a cooking pan over medium heat.
Add oil and then add crab, minced garlic, lemon juice and old bay seasoning. Mix well in a pan and saute for a few minutes, until the crab meat is cooked. Take out and set aside.
Butter one side of the two slices of bread, the sides that will be the outside of grilled cheese.
Place both slices of bread, buttered side down, in a pan.
Divide sliced mozzarella cheese between the two breads, covering it as evenly as possible. Sprinkle a little salt over cheese.
Layer bacon, tomatoes and cooked crab meat over one of the slices of bread. Cover it with the other slice once cheese starts to melt. (That way your cheese slices won't fly all over the pan.)
Press gently and cook on both sides until all the cheese is melted.