You're
asked a splendid question. Asian food labels are tough to decipher --
even for native speakers! With regard to banh trang, you're correct
in the meaning of the terms. However, the banh trang use for fresh,
unfried spring rolls are thin, opaque white discs.
In Vietnamese,
there are actually two ingredients called "banh trang". One
is thicker and usually has white or black sesame seeds embedded in them.
Sometimes called "banh trang nuong" or "banh da",
these dried brittle discs are grilled or baked to a crispy nuttiness.
They're are eaten as a snack (like a fat-free chip, if you will), used
to scoop food up or broken into small pieces to be eaten with certain
noodle dishes.
The
type you're inquiring about is nearly transparent and has beautiful
basket-weaving markings, reflecting how they're dried on bamboo matting
or frames after being steamed. They have a slight sour-salty flavor
and need to be dipped in warm or hot water before usage. Here's a picture
comparing the two; what you want is on the top.
For your
fresh spring rolls (goi cuon, sometimes also called summer rolls), you
want to look for these below:
To
prevent them from breaking, they're sold in thin plastic casings or
thick plastic packages. Note that the packaging will often say "spring
roll skin" or "spring roll wrapper". Of the three above,
two of them are of the red rose brand, which consistently tends to be
a good one to go with. The photo above has the common sizes, 8",
5" and the quarter wedge. These rice papers are also used for Vietnamese
fried imperial rolls.
If you'd
like more clarification or information, let me know!
Happy cooking
and eating,
Andrea