Probs worth comparing kJ energy too as raw mass isn't the whole picture. Like trying to get your rdi from peanuts will be interesting....

It is also worth some thoughts about complete protein combos and digestibility but unless you are literally trying to avoid starvation and accidentally just eat lentils and rice for all your meals you will be fine.

In general, unless you're a professional athlete a budget diet that meets your needs will look something like oat or baked bean breakfast (BBs you'll want some extra energy from bread or whatever), leftovers from last night for lunch, a dinner rotating through beans and lentils. Daal, curries, stews and so on. Random reasonal veg and some greens to get variety. Greens can be pricey, but if you have a garden or a patch of ground you know isn't poisoned warrigal greens grow like a weed, dandelion greens taste pretty nice, and so does milk thistle actually! just learn to ID them and never pick from roadside.

That's how I've avoided starvation while also eating well in the past.

Certainly interesting, but I feel like the X-axis needs to somehow account for all the valuable qualities of the food. If we're wanting to compare meats and meat alternatives, that means at least protein, iron, and energy, not just protein.