Whisk together goat’s milk, cow’s milk, sugar, and cinnamon in a VERY large pot (mixture should be no more than halfway up side of pot. If it’s more than halfway up, make in batches, larger pot, or 2 pots). Place pot over medium-high heat. Whisk mixture regularly until mixture comes to a simmer.
In small bowl mix together baking soda and water until well combined. Remove pot from heat and slowly whisk in baking soda. Mixture will bubble up, so be careful that it does not go over side of pot. When the bubbles/foam subside, place pot back over medium-high heat. Bring back to a simmer and adjust heat as needed; stir regularly. NOTE: Be careful because if the temperature is too high the mixture will boil over.
Cook Cajeta about 2-3 hours or more until reduced to desired thickness and color is deep brown. Pour Cajeta through a sieve if desired to catch any particles on bottom of pan. Store Cajeta in sealed containers in refrigerator (for up to a month) or in the freezer (for at least a few months). Reheat Cajeta in pan or microwave before serving.
To flavor the Cajeta, divide the basic Cajeta into different containers before adding the flavorings. My Cajeta was 9 cups, so I divided it into 3 (3 cup) containers. But if you have a different amount of Cajeta, just adjust the flavorings a little. You can’t mess it up; it will taste great regardless!
DARK MOCHA CAJETA: To 3 cups hot Cajeta, stir in 3 tablespoons unsweetened dark cocoa powder and 1 teaspoon of instant coffee until cocoa and coffee granules are dissolved.VANILLA CAJETA: To 3 cups hot Cajeta, stir in 1 tablespoon good quality vanilla extract.AMARETTO CAJETA: To 3 cups hot Cajeta, stir in 1/3 cup Amaretto until well combined.SNAPPY TIPS: Make sure you keep an eye on the Cajeta while it’s on the stove and stir regularly. If the temperature isn’t quite right it can boil over.SNAPPY SUBSTITUTIONS: I’m sure any combination of goat’s and cow’s milk would work fine. I used heavy cream, skim milk, and goat’s milk because that’s what I had on hand. I have used all sorts of combinations and although the taste may differ, it’s all good! Instead of Amaretto you could use any of your favorite liqueurs. Instead of dark cocoa powder you can also use regular unsweetened cocoa powder.