This is obviously not  Izakaya food at all and is probably the ultimate antithesis of it. I  never thought I would be making this dish. But 
the aforementioned new  gourmet grocery store has a large section of bulk grains and beans. All  kinds of interesting items can be found there and you could even grind  the grains of your choice or in combination to make your own flours. I  actually found red beans or 
azuki 小豆 あずき (altenetive spelling, "adzuki"). I have never seen raw azuki beans being sold in the U.S. before* (
canned cooked azuki  is available). Tokachi plane 十勝平野 in Hokkaido 北海道, the northernmost  island of Japan where I am originally from, is famous for producing  azuki.  I have never attempted to cook azuki before--and there are  reasons that I haven't. The most common use of azuki is to make Japanese  sweets called "an" 餡, from which traditional Japanese sweets such as  "Yokan" 羊羹 and "Zenzai" ぜんざい etc are made. I do not particularly care  for them. They are also used to make "red rice" or "sekihan" 赤飯, a  traditional celebratory food, which, I did not particularly like as a  kid, liked even less as an adult and avoided eating if at all possible.  Despite all this, when I saw the azuki in the bin, I had to get some. I  have been in the U.S. too long, perhaps (or maybe the novelty of the  situation overcame me).
*I was wrong about this. I simply was not looking for it before.  I did find raw red beans, vacuum packed, as well as canned cooked - both sweetened and un-sweetened - red beans in our Japanese grocery store (only one left in DC area).

 
The  above picture is a classic Japanese sweet called "zenzai" ぜんざい or  "O-shiruko" お汁粉 consisting of sweet azuki beans and grilled "mochi" rice  cake. To my surprise, this was the best version of this dish I ever  made. (Since this is the first time I ever made it "best" was not hard  to achieve). But above and beyond that it was also the best I ever  tasted. Granted, I've only ever eaten it a few times before and that was  a long time ago. Even my wife agreed that this was the best she's eaten  (she may actually have eaten some in Asakusa as recently as few years  ago). If memory serves me correctly, the last time I had this dish was  when I was in high school accompanying my classmate (sweetheart).....of  course, back then this was something "girls" liked to eat. I recall it  was sickeningly sweet and the only reason I ate it was because my  classmate wanted some, not because I liked to eat "zenzai" )
 
In  any case, a quick internet search revealed more than a few entries on  how to cook azuki properly. I read a few of them and amalgamated them  into the recipe I used. I think the secret was that I was careful not to  make it too sweet.
Azuki beans look like this (image  below left), I think I had about 1 pound. I washed and soaked the beans  in plenty of water overnight. I cooked the beans on high flame using the  water they soaked in. When the water came to a boil, I turned the flame  down to a vigorous simmer (if such a term exists--it is just a tad  below "gentle boil") for 10 minutes. I drained and washed the beans in  cold running water. I put the beans back in the pot and added fresh cold  water (3 times the volume of the beans). After the water started  boiling I turned it down to a vigorous simmer. Small white bubbles or  scum soon covered the surface, I skimmed it off repeatedly. If the water  level went down too far, I added more hot water. After 30-40 minutes,  it looks like this (image below right).  I tasted the beans, they were  now soft. I set aside a portion of the simmering liquid and beans to use  for other dishes, and continued making this dish. It appears important  to add sugar in stages to keep the beans soft. So I added about 1/4 cup  first. I cooked it for a while, tasted it (not sweet enough even for me)  and add more sugar until I thought the sweetness was right (for me,  that is. It must be a half of the recipe calls for). You could keep  cooking to your desired consistency but I like it a bit soupy. I added a  pinch (1/2 tsp) of salt at the end which supposedly enhances the  sweetness.

 
I  had some packaged mochi in the fridge left over from New Year. I cut  the mochi into 4 small squares and toasted it in the toaster oven.  (Since the mochi will become very sticky when cooked, I put the cubes on  some aluminum foil). When it puffed up and browned slightly, I put it  on the top of sweet azuki as see in the first picture.
My  wife really liked this but said she would not consider it a  dessert--Translation: "Do not attempt to serve this to me as a dessert.   If you would like to serve it as a starch side with the meal--perfectly  acceptable".  In any case, I am planning to make some more savory  dishes using azuki. No wine or sake will go well with this dish. "
Bancha" 
番茶 or "
Hojicha" ほうじ茶, Japanese roasted tea will be the best bet as your choice of libation.