In many countries you can buy real stock concentrate gels in little pouches or packs
Brands like Continental, Knorr, and often "private label" from local famous chef's
I can't vouch for a specific brands flavour, but in general they add a lot of flavour for very little weight (30 to 40 grams, 1 ounce in old money)
Add that to some lentils, split peas, or dried vegetables and it should make a tasty and high calorie meal
Pack some vacuum sealed bacon fat or other fats for a bit more zing and calories if you need
In total: 120 g of lentils etc, 30 g stock, 30 g fat or dried meat makes a tasty meal for two, and about same weight as your average dehydrated meal. And you can pack your own, and leave out most of the the fancy foil packaging
Some lentils and split peas take more than 15t minutes cook time, so you either need a wood fire or an insulated cook pot