Lentils in a hundred ways, in pasta sauces, as an alternative for rice, black lentils for burgers, black or green lentils simply boiled, salted (halfway through cooking) and seasoned well. Your gut will thank you and its iron and protein is very high, and super cheap.
Just get tons of different veggie + meat (or meat alternative) combos (potatoes are also a high satiating index if you are trying to cut. 400g of boiled potatoes is a fuck ton of food for 350 calories)
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Salmon + any light, roasted veggie (asparagus, carrots and parsley, broccolini, etc..)
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roasted veggies in general: beets, filled courgette boats, filled peppers, carrots, cauliflower (harissa paste and smoked paprika marinades are amazing on cauliflower), etc..
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mushroom pasta: sauteed mushrooms (first sweating them on high heat) with your choice of other protein, take out when ready and make a white wine, cream, and shallot/red onion sauce with some chickpea pasta or other higher protein alternative
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shakshuka: essentially egg, tomato, and onions that can be used as a sauce for meat or supplemented with chickpeas and used with bread as a dip
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legume meal dips: e.g. red lentil dip: cook onion in olive oil, add garlic, add spices: cumin, coriander, chili powder, paprika, turmeric, bay leaves, pepper, tomato paste and cook for a minute, then add a can of tomato pieces, 250g red lentils, a can of chickpeas, and half a liter of your choice of stock, simmer for 15-20 minutes and add 30-50g of nutritional yeast. This is insanely good and has tons of protein, fiber, and minerals and you can supplement with additional proteins like chicken and dip with bread, tortillas, naan, or just rawdog it with a fork. There are also tons of variations with different veggies and spice combinations ) like a spinach variant that is great) Soph's Plant Kitchen on Instagram has a bunch of these type of recipes, you can always supplement with meat if that's your thing.
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Spanakopita: easy, filling, and goes with a lot of red meats like lamb, beef, etc... Phyllo dough then add leafy veggies like spinich and arugula and leek cooked down in a pot for 10 minutes or so with feta and boiled quinoa or boiled bulgur added and then lay out the dough in a baking dish in alternating directions: 4 layers, filling mix, 4 layers, brush with oil on top, trim edges, bake, done and you have a side dish for a week.
You can honestly take a ton of recipes and just tweak them to make them healthier. Learning to cook and learning to use spices is like the #1 life skill and makes fitness diets a lot more interesting and tasty.