I'm hankering to try out this recipe I have for Cream of Zucchini Soup (it's pretty toasty here in the Mitten State today and a little chill soup sounds perfect). However, the recipe calls for 1 teaspoon white miso, which I have not been able to find at a handful of grocery stores (rest assured, I will continue looking). In the mean time, is there something that I could substitute for white miso? I was thinking plain or greek yogurt, broth or bullion? I could be way off, having never tasted white miso before (I do know that it's made of soy - it's been described to me as sweet and mild tasting). Or do you think I could just go without it?