Separate the larger broccoli looking pieces from the parts of the broccoli rabe that are just greens. The larger pieces take a bit longer to cook.
Heat olive oil in a large skillet over medium heat. Add garlic and sauté, stirring frequently until it just starts to brown.
Add the larger broccoli-like pieces of the broccoli rabe, the vegetable stock, sun dried tomatoes, and red pepper flake. Stir, reduce heat to medium low and place a lid over the pan for 4 minutes.
After 4 minutes has elapsed, remove the lid, add the greens part of the broccoli rabe and lemon zest. Return the lid for 3 minutes or until the greens have wilted.
Remove the lid once more and stir in the lemon juice, white beans and a pinch of salt and pepper. Remove from heat.