Whisk Tamarind Concentrate and Sugar in a medium sauce pot over medium heat until sugar dissolves. Add Fish Sauce, Soy Sauce, Garlic and a pinch of Chili Paste or Red Pepper and whisk. Bring heat to high, boil for 30 seconds, remove from heat immediately. Taste the sauce. If it is not salty enough, add 2 DROPS of Fish Sauce (watch out, the flavor is very strong). If it is too sour, add more sugar. If it is too sweet, add more Tamarind Concentrate. If it is too fishy, add a squirt of Lime Juice. If not spicy enough, add more Chili paste or ground red pepper. Allow to cool for 10 minutes before using or bottling.