I do the cottage pie recipe below and just sprinkle lentils in to the mince mix at the same time as the salt and pepper. Can't even tell by taste, though it does make the mixture a bit smoother once cooked.
Recipe: Cottage pie
Category: Beef
Servings: 6
Ingredients:
900g lean minced beef
1 onion
1 carrot
2 tbspn plain flour
1/2 tsp cinnamon
2 tbspn tomato paste
1 tbspn dried thyme
600ml beef stock
Salt and pepper
Topping
700g potatoes
450g parsnips
3-4 tbspn mayonnaise
75g grated cheddar
Prep Time: 45 mins
Total Time: 1hr 45 mins
Cooking Time: 1 hour
oven Temperature: 200 C
Directions:
Fry onion and carrot. Add mince and brown. Add flour, cinnamon and tomato paste. Stir for one minute and add thyme, stock, salt and pepper. Bring to the boil, summer for 40 mins.
Boil water and add root veg, cook until soft. Drain, dry in hot pan for a minute, mash and stir in mayonnaise and most of the grated cheese.
Put meat in Pyrex, spoon on mash, sprinkle over the rest of the grated cheese.
Cook at 200C for about 20 mins until brown and bubbling. Serve with green veg.