I really think I nailed this finally after years of mediocre veggie burgers, My youngest son (although I wouldn't say he had refined taste buds) declared these as good as meat burgers and that's what he usually eats. Fairly firm, good texture, great taste. Freezing the tofu is the key. Please do let me know what you think if you try them
From the recipe book Bal's Quick and Healthy Indian by Bal Arneson, This said it serves 4 but it uses only 12 prawns so number of servings would depend on how hearty is your appetite and how big are your prawns. I sure ate more than 3- it was so delicious.