Onion. It’s cheap, nutritious, acts as a low-key anti bacterial solution, can be served in a multitude of ways, or eaten raw.

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Well, something being delicious is subjective, but if we assume a “general acceptance” of most delicious foods, potatoes could fit easily. They can be cooked in all kinds of ways, are very nutritious and, again, pretty much everyone says they’re delicious.

Lentils.

So… Are you just unaware of fruits, vegetables, and legumes, haha? In my opinion there’s a huge amount of food that fits all three categories. One of the best example of cheap, delicious, healthy, and easy is beans and rice, spiced up however you like.

Most fruit that’s in season would cover all three.

You already mentioned them, but I’m a huge fan of lentils. They go with so much stuff and you can combine them with a variety of spices. Give me any leftover ingredients and some lentils, and I’ll cook up something delicious. I can and will eat lentil soup for days.

They are also a pretty solid crop, they can grow in a variety of climates, require little water and are good for the soil.

Carters’ peanuts :)

Nutritious is very relative to industrialized food production. The most nutritious natural products are perceived as wild and are not objects of agriculture. Basically the objects of agriculture were selected on the ease of reproduction, not their nutritious value, or their cost. It just so happened that those that were easy to plant and grow were the leanest in quantity and complexity of nutrients. Many of the most nutritious seeds, fruits, and vegetables are becoming extinct with the elimination of natural forests. Planted forests would take thousands of years to stabilize as ecosystems (if ever) and be concidered sustainable food sources.

Cheap means the industry hasn’t been able to monopolize, but labor is very exploitable (see bannana republics, tea and coffee plantations). It also means the quantities produced have saturated the markets and the product is in abundance (wheat, corn, soy,…).

Delicious … only N.Europeans (and their N.Am. Oceania descendants) would consider eating a single element alone and judge it by taste. The rest of the world eat what they can get, spice it up, mix it, and make taste a final product of a mixture of things with a labor intensive process of preparing it. The dairy industry (waste of nutritients and exponentially waste of land use) and the sugar industry (it should have been banned under substance abuse addictive product that is a health hazzard as well) have blurred what “delicious” really means. Take as an example banana split ice cream, there is little nutritious value, if not harmful as a whole, made of three industrial products that maximize labor exploitation. If it wasn’t for capitalism nobody in their right mind would have come up with this one. It only exists because of capitalism.

Nutrition has been a dead end disaster since its early days of being industrialized.

Whole grain pasta.

IMHO, steamed vegetables are right in the middle of the triangle. I’ve bought a steam cooker and it’s a game changer compared to boiling. It’s healthier since less nutrients are lost, preserves so much more taste and texture, there’s a timer so you can start the steamer and go do something else. Also makes you use less water. I’ve still got to try steamed fish but I expect it’ll taste great.

Roasted brussel sprouts with butter and parmesan cheese

I was looking at similar requirements for my daily lunch during the workday. I live in London so you’re paying between £5 and £10 per day even for just a sandwich-based lunch. I needed a packed lunch that was cheap, tasty, healthy and additionally: filling, easy/quick to prepare and low carb. So that’s a big ask.

I settled on a kind of custom Greek salad. One cucumber, some red onion, pickled beetroot all diced up, olive oil (or cold-pressed rapeseed oil) and some feta cheese. Sometimes I add chickpeas and coriander.

It’s perfect, I’ve been eating it for years now.

humus

Ah yes, a food that you can eat for three days without pooping while you stay in a tent?

Rice

literally any bagel sandwich, unless the cost of eggs or ham is still rlly high in your area. low effort, immaculate.