Honey Roasted Plums and Ricotta Crostinis

6 plums
2 tablespoons honey
2 tablespooons extra-virgin olive oil, plus 1 teaspoon
1 sprig of fresh rosemary
1/2 cup ricotta
8 slices of good quality bread
1/2 lemon's zest, thinly sliced

1. Preheat oven to 400 degrees. Slice plums in half and extract the seeds. Place the plums cut side up on a baking sheet.  In a small bowl, mix together the honey and olive oil until combined. Pour over plums casually. Sprinkle rosemary and a few pinches of salt on the plums. Transfer them to the oven and bake until they're slightly tender and release some juice, about 15 minutes.

2. Meanwhile, heat a grill pan over moderately high heat. Brush the pan with olive oil and grill bread until toasted on both sides. Allow the plums to cool slightly and cut them into 1/4-inch slices. Scoop a tablespoon of ricotta onto each piece of bread, spreading it evenly. Top with a few slices of sliced lemon zest.