Add a tablespoon or two of olive oil to a medium skillet. Over low to medium low heat, toast both slices of bread on each side. This should take a minute or two per side. Toast until they're nice and golden brown on both sides. You can also toast your bread in a toaster.
Remove slices of bread and put on a plate. Rub the side you'll layer with your ingredients with a garlic clove.
Spread goat cheese on both slices. Layer with prosciutto and top with arugula.
Garnish with fresh lemon zest, drizzle with olive oil and balsamic vinegar. Sprinkle with Maldon salt and enjoy!