You can use Spelt or Kamut
Roman meals were family meals. Other people who attended the meals were guests who were invited.
We care barley like any other plant. Put it in sunshine, water it, etc.
In our vegetable and spice soup, we used barley out of many other vegetables.
Most beers contain barley. Other than that, not much. Barley water, obviously, You can get barley grits and barley flour, so also barley breads. Pretty uncommon though. Pearl barley is used a lot in soups, but mostly only in home cooking, not so much in canned soup.
Hordeum vulgars
Rice is the most commonly used ingredient in traditional southern meals, as it grows well in southern China. Other grains like wheat and barley are grown in the northern areas and are the staple food in northern China.
beer (with other ingredients)
Barley is a cereal of the species Hordeum vulgare, or its grains, often used as food or to make beer and other malted drinks.
There are many countries that grow barley and other grains. The top producing countries are Russia, Ukraine, France, and Germany.
Other than an allergic reaction, there are no known adverse effects attributed to barley grass.
Same things as everyone else. Most meals had barley breads, rye breads, oats, oatmeal, soups, stews, vegetables, apples with honey.