To prepare a supa stuida recipe, first you need to gather your ingredients. First, you'll need the following ingredients: 1 tbsp. ground cumin, 1/4 cup ground coriander, 1/2 cup chopped cilantro, 1 cup water, and 1 teaspoon kosher salt. Mix the ingredients together until they're well combined. Next, add the tamarind juice to the mixture and mix until it's completely dissolved. Add the coconut milk and stir to combine. Finally, pour the batter into the prepared pan and cook it on medium-high heat, stirring frequently, until thickened, about 5 minutes. Remove the pan from the heat and allow it to cool completely. Once cool enough to handle, cut the cake into squares and store them in an airtight container in the refrigerator for up to 3 days.