Lentil soup is a hearty and wholesome meal that can be enjoyed as a main course or part of any meal. Here are some ideas for what to serve with lentil soup:

1. Bread: Serve a crusty baguette or whole-grain bread on the side of your bowl of lentil soup, as it helps mop up any leftover broth and adds texture to every bite. You can also try serving focaccia or sourdough bread with toppings like garlic butter, rosemary, or cheese.

2. Roasted Vegetables: Roasted vegetables like sweet potatoes, Brussels sprouts, and carrots are great accompaniments to the earthy flavors of lentil soup.

3. Salad: A simple green salad or a Caesar salad can be a great match for lentil soup. For something Asian-inspired, try using a ginger-carrot dressing or topping it with edamame and sprouts. Greek salad is also a good option.

4. Rice: Yellow rice, brown rice, or coriander lime rice can be a fantastic side for lentil soup. The gentle flavor of the rice is a perfect counterpoint to the robust, earthy taste of the lentils.

5. Naan Bread: Homemade naan bread is a great side dish to serve with lentil soup. Its perfect for soaking up the broth and adds a nice texture to the meal.

6. Grilled Sandwich: Bombay grilled sandwich or grilled apple and brie flatbreads are elegant and sophisticated choices for what to serve with lentil soup.

7. Quinoa: Quinoa, like lentils, is a good vegetarian combination of carbohydrates and protein. Its a great way to add some extra fiber to your diet.

8. Beer or Wine: A full-bodied red wine like a Cabernet Sauvignon or Syrah can complement the earthy flavors of the lentils and add depth to the dish. If you prefer white wine, try a Chardonnay or Pinot Grigio for a lighter option that wont overpower the flavors of the soup. A dark ale like a Porter or Stout can match the richness of the lentils and provide a cozy feeling on chilly nights.

9. Cheese: Grilled cheese sandwich or a sprinkle of feta cheese on top of the soup can be a great addition.

10. Pita Chips: Pita chips are a great crunchy side dish to serve with lentil soup.

11. Spinach: Sautéed spinach is a simple and healthy side that works well with lentil soup. The earthy flavor of the spinach echoes the lentils, while its lightness balances the soups heartiness.

12. Mushroom Pilaf: Mushroom pilaf is a warm and hearty side to serve with red lentil soup. It is super filling but still very healthy.

With so many options, you can choose the one that suits your taste and preference.