Roughly chop the Tamarind pulp and place it in a bowl with 50ml (3 tablespoon + 1 tsp) boiling water. Allow it to steep for 10 minutes, stirring occasionally and then pass it through a fine mesh sieve.
Peel, deseed and cut the pumpkin or squash into a 20-25mm (¾-1) dice.
Peel and grate the onion.
Mash the garlic cloves.
Peel and grate the ginger.
Finely chop the chilli pepper.
Add the cooking oil to a 28cm or 11" frying pan or skillet over a medium heat. When the oil is up to temperature, add the turmeric and stir.
Throw in the garlic, ginger, chilli and grated onion. Cook for 3-4 minutes, stirring occasionally.
Add the tamarind pulp, mint sauce and soy sauce and stir.
Add the pumpkin and 125ml (½ Cup) water, then stir and add a lid. Cook for 20-25 minutes on low to medium or until the pumpkin is cooked through.
Before serving, have a taste and add more soy sauce if you need more salt and maybe a sprinkle of sugar; the latter will depend on your pumpkin.