Step #1 Heat a grill pan over medium-high heat, or preheat a broiler.
Step #2 Lightly brush 1 side of each bread slice with 1 tbsp olive oil, sea salt, & pepper; toast lightly, & sprinkle with rosemary, about 2 mins per side.
Step #3 Loosely cover toast with aluminum foil wrap to keep warm.
Step #4 Fill a large skillet with water to within 2 inches; bring to a boil.