In a saucepan, add water, tomatoes (whole), chilis (if using) garlic, ginger, and almonds. Boil for about 5 minutes until the peel in the tomatoes cracks. Drain off all of the water. Let tomatoes cool enough to remove peels. Toss everything into high speed blender with tahini, sugar, salt, vinegar, and soy sauce, and blend until very smooth. Do NOT add any additional liquid. Store in fridge. Can be served cold or room temp. Serve as a dipping sauce for Momo.