Question on quantities: 20g of pasta to 500ml of water? That's about a tablespoon of pasta. There's nothing to stir, let along worry about forming blo

Clearly there is a typo in the amount of the trahanas quantity because 20 grams isn't going to give you the result in the photo. My initial thought was that the missing digit was a zero (200 g) or one (120 g).

For most of the world's dried starches, the typical serving size for a small portion should be around 40 g and for larger portions ranges from 60 to 80 grams whether it is dried grains (of all types like rice, polenta, oats), dried noodles, etc.

Doing a little sleuthing around on the Internet, it appears that trahanas is traditionally sold in 400 g bags and each serving is 100 g. Thus the recipe should be 200 grams (for 2 servings). Some of the packages for the US market are larger 500 gram quantities but today's Americans ***LOOOOOVE*** to carbo-load and bust their guts.

Note that a typical oatmeal serving is about 40 g (dry). I know my own breakfast oatmeal portions are a smaller 30 g but I always eat something else as well. This recipe is going to produce a whopper of a bowl. Carbo-loading has zero appeal to me so I'm happy with my sub-standard portions of starches.

Best of luck.

https://www.dianekochilas.com/what-is-trahana/
According to the above link, trahana is a small pasta, almost like grits, so in this recipe you'd be making something that would resemble a thick gruel or porridge suitable for toddlers.