1. 1. Preheat the oven to 375°F (190°C).

2. 2. In a large skillet, cook the bacon until crispy. Remove the bacon from the skillet and set aside.

3. 3. In the same skillet, add the ground beef and diced onion. Cook until the beef is browned and the onion is translucent. Drain any excess fat.

4. 4. Add the chopped garlic, bell pepper, asparagus, and broccoli florets to the skillet. Cook until the vegetables are slightly tender.

5. 5. Peel and slice the Idaho potatoes into thin rounds.

6. 6. In a greased casserole dish, layer half of the potato slices at the bottom of the dish.

7. 7. Spoon half of the beef and vegetable mixture over the potatoes.

8. 8. Crumble half of the cooked bacon over the beef mixture.

9. 9. Repeat the layers with the remaining potatoes, beef mixture, and bacon.

10. 10. In a small saucepan, melt butter and mix in tahini until smooth. Pour this mixture over the casserole.

11. 11. Cover the casserole with foil and bake for 45 minutes.

12. 12. Remove the foil and bake for an additional 15 minutes until the potatoes are tender and the top is golden brown.

13. 13. Serve hot and enjoy!