Place rooster and 12 cups water in a big pot. Lower inexperienced tops from scallions; add to pot. Lower a small nub off ginger; put aside. Lower remaining ginger into quarters (don’t peel) and halve shallots; toss ginger, shallots, and peppercorns into pot. Put aside a handful of basil and submerge the remainder in pot; convey to a boil. As liquid heats, skim off any foam, however attempt to not take away an excessive amount of fats (you’ll use it later). As quickly as liquid is boiling, scale back warmth and gently simmer till rooster is cooked by means of, about quarter-hour for legs and 20 minutes for breasts (an instant-read thermometer inserted into the middle of a bit ought to register 155°; temperature will proceed to rise off warmth). Switch to a plate; let cool.
In the meantime, pressure inventory into a big bowl (you’ll have about 10 cups). Use a big spoon or ladle to skim off any fats from floor right into a small bowl; put aside. Measure out 2½ cups inventory; style and season with salt. Reserve remaining inventory for making Cut up Pea Soup, or one other use.
Rinse rice in a sieve, stirring together with your fingers till liquid runs largely clear. Shake off extra water and switch to a medium nonstick skillet. Add reserved 2½ cups inventory and produce to a boil over medium-high, about 4 minutes. Scale back warmth, cowl skillet, and simmer till rice is tender and liquid is generally absorbed, 8–10 minutes.
Drizzle reserved rooster fats round fringe of pan (don’t stir). Improve warmth to medium-high and prepare dinner rice, uncovered, till underside is golden and crisp, 10–12 minutes. If pan appears dry, drizzle vegetable oil round fringe of rice as wanted. The objective is an evenly browned backside with tender rice on high.
Whereas rice is crisping, reduce scallion whites into skinny rounds and finely grate remaining piece of ginger.
Pull rooster meat off bones and shred; discard pores and skin and bones. Divide rice and rooster amongst bowls; season with salt. Add some avocado, scallions, grated ginger, and reserved basil to every. Serve with lime wedges, sizzling sauce, soy sauce, sesame oil, and vinegar as desired.
Do Forward: Rooster will be poached 3 days forward. Cowl and chill rooster and strained inventory individually.