I also had fresh Japanese "shishi togarashi" 獅子唐辛子 pepper. So I just fried it as a side. I served the renkon dish with a wedge of lemon and green tea salt.
This is a rather unique and good dish. The renkon remains crispy and the avocado creamy with salty and lightly spicy (I did not add too much Sriracha) tarako flavors come through.
One segment of fresh renkon, peeled and sliced (about 1/2 to 2/3 inch thick, I got a total of 12 slices).
6 perilla leaves
One sac of tarako, roe scraped out from the sac (#1)
One ripe avocado, stone and skin removed (#2)
Sriracha or other hot sauce to taste
For tempura batter
1/4 cup cake flour plus a bit more for dredging the renkon slices
1/4 cup carbonated water
Oil for deep frying
Directions:
Mash and mix the avocado, tarako with the sriracha hot sauce to taste (#3 and #4).
Lightly dredge the renkon slices. Put on a perilla leaf and then 1/6 (2-3 tsp) of the stuffing (#5).
Top the stack with another slice of renkon. Press lightly to secure (#6).
Mix the cake flour and cold carbonated water to make a relatively thin (like crepe batter) tempura batter.
Dip and coat the renkon “sandwich” and deep fry (#7) for fa ew minutes on one side. Turn it over and cook another few minutes then drain (#8) and serve.