extracting resin from Ferula asafoetida / hing roots

Hi, I have grown asafoetida in my polytunnel for about 5 years now so the roots are large enough to be harvested but I have no idea how to extract the resin. Please has anyone done this before?

I love to cook with hing and am keen to know what it tastes like for real rather than out of a little yellow pot! I guess it is strong as this product is diluted with flours.

thanks

Cesca

A five year old question I'd love to know the answer to too!
Anyone?

From Wikipedia: "The resin-like gum comes from the dried sap extracted from the stem and roots and is used as a spice. The resin is greyish-white when fresh, but dries to a dark amber colour. The asafoetida resin is difficult to grate and is traditionally crushed between stones or with a hammer. Today, the most commonly available form is compounded asafoetida, a fine powder containing 30% asafoetida resin, along with rice flour or maida (white wheat flour) and gum arabic.

Ferula assa-foetida is a monoecious, herbaceous, perennial plant of the family Apiaceae. It grows to 2 m (6.6 ft) high, with a circular mass of 30–40 cm (12–16 in) leaves. Stem leaves have wide sheathing petioles. Flowering stems are 2.5–3 m (8.2–9.8 ft) high and 10 cm (3.9 in) thick and hollow, with a number of schizogenous ducts in the cortex containing the resinous gum. Flowers are pale greenish yellow produced in large compound umbels. Fruits are oval, flat, thin, reddish brown and have a milky juice. Roots are thick, massive, and pulpy. They yield a resin similar to that of the stems. All parts of the plant have the distinctive fetid smell.[10]"   https://en.wikipedia.org/wiki/Asafoetida

So it's a perennial herb in the celery family Ferula assa-foetida. It's not closely enough related to Lovage (Levisticum officinale) for me to want to try faking this!

this is short but explains where the rhizome is cut and the resin originates... so very interesting!
http://www.biologydiscussion.com/economic-botany/spices-obtained-from-roots-economic-botany/51944