Lentils are a good ingredient, I always add a good handful to a ragu when making Lasagne, in soups they add texture and thicken.
I only ever use red lentils.
If you want a good “rainbow” recipe this is a family favourite;
1 Tin of kidney beans, 1 tin cannelini beans drained. Add 1 finely diced carrot, 1/2 red pepper, cucumber, celery, spring onion or red onion a handful of raisins, cherry tomatoes. Mix well and stir through some home made dressing and season.
Our children always named it “ fart salad” there was usually a bowl of it in the fridge that they would help themselves to at all times of the day and night!
It’s really cheap, quick and nutritious it fills you up for along time.