boil, cook
煮 centers on cooking food by boiling it in liquid, typically water or broth. It covers the act of boiling and the resulting cooked state.
煮 combines 者 (which likely contributes the sound) with 灬 (fire), suggesting cooking with fire. The modern form keeps this phono-semantic structure clearly.
The top 者 looks like a person stirring a pot, and the bottom 灬 is the fire underneath. Together they show someone boiling food over a fire.
For シャ, imagine a chef boiling a pot of stew and saying 'Shall we add more salt?' — 'Shall' cues シャ while the pot boils.
to boil; to simmer; to stew; to seethe
stew; hodgepodge
nimono; food cooked by boiling or stewing
(small crunchy) dried sardines
preserved food boiled in sweetened soy sauce
imoni (taro and meat soup)
sweet eel sauce (brushed on a sushi topping)
soup containing rice cakes and vegetables (New Year's dish)
vegetables or fish boiled in soy sauce
to boil well; to stew; to simmer (for a long time)
to be boiled; to be cooked
broth
boiling up
various foods cooked together; hodgepodge; hotchpotch; mulligan stew
to boil down; to concentrate (soup, milk, stock, etc.)
boiling water
candied (chestnuts)
cooked beans
cooking
to boil; to be boiling hot; to be on a rolling boil