Step 1

In medium saucepan, combine broccoli rabe and 1/4 cup water; bring to boil over high heat. Reduce heat and cover. Simmer until tender, 3 to 5 minutes. Drain.

Step 2

In medium nonstick skillet over medium heat, warm oil. Add garlic and cook, stirring constantly, until fragrant, about 1 minute. Add broccoli rabe, bell pepper, salt, and red pepper flakes. Cook, stirring often, until heated through, about 2 minutes.

Step 3

Preheat broiler. On top of bread, spoon broccoli rabe mixture. Sprinkle with fontina. Transfer to broiler pan and broil 5 inches from heat until cheese is just melted, about 1 minute.

Step 4

Serving size: 1 sandwich