Where in Australia can I get a large wooden mortar and pestle for making green papaya salad?
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Unfortunately I don't know where to get a big mortar and pestle in Australia, I would guess asian shops.
However: I have made thai green papaya salads with and without a mortar. The mortar helps release and combine the juices and flavors. However, if you don't have one there is no reason to rush off and buy one ... you can blitz nuts, garlic (or use garlic press) and chillies in a food processor quickly if you want really small peaces, and the rest of ingredients (the shredded veggies) you can just knead a well with your hands/fists in a bowl ... and it works pretty well to get really nice delicious salad.