you could give him finger food
steamed carrot sticks, broccoli and cauliflower florets, chunks of apple and pear
lidl often have half price fruit and veg
zap a potato in the microwave until soft , scrape out the potato and mash with a little butter and some cheese, or cream cheese...
a 7 month old will still be getting a lot of nourishmnet from milk and does not need 3 big meals a day
rice cakes or porridge for breakfast with some dried or fresh fruit
a mashed banana, avocado or some yoghurt for lunch
a bit of penne pasta, or mashed potato with cheese for dinner
cheap as anything, and a lot less salt and preservatives etc than are in cheaper meat
lentils are good to bulk out minced meat to make things like spag bol
as long as he is getting milk and some food, he will be fine
really at this stage, it is more about tastes of food and getting used to different textures than eating 3 meals a day
have a look here for ideas on finger food for your baby www.babyledweaning.com