In a mixing bowl, combine the oil, eggs, water, and vanilla. Mix well.
Reserve ½ cup of flour, Add the walnuts and raisins.
In a bowl, combine the flour, sugar, baking powder, baking soda, and all of the dry spices. Slowly add the flour mixture to the eggs. Mix well until all of the flour is incorporated into the batter.
Add the carrots and mix well.
Add the walnuts and raisins and the remaining flour into the mixture.
Pour the batter into a well greased Dutch Oven.
Place the Dutch oven over the prepared coals. Add enough coals to maintain a baking temperature of 350. Rotate the oven ¼ turn every 15 minutes, and rotate the lid ¼ turn in the opposite direction at the same time.
Bake until a pick comes out clean. It will take approximately 1 hour to bake, but be sure to test the cake and bake a little longer (or shorter) if necessary.
Notes
For information on how to cook in a Dutch oven, read more here.
Before beginning the carrot cake recipe, be sure to light your charcoal so that it can be burning down while you prepare the cake.
If baking this in an indoor oven, preheat the oven to 350. Bake about 40 minutes until a pick comes out clean.
If baking in a solar oven, bake uncovered in a hot solar oven. Pre-heat the solar oven before adding the cake. Keep the sun turned into the sun to maintain the temperature. The time needed to bake will vary depending on the type of solar oven, the temperature of the oven, and the amount of food being cooked. Bake until a pick comes out clean. It will take about 1½ - 2 hours.
Recipe by Sunshine On My Shoulder Solar Cooking Guide at https://www.sunshineonmyshoulder.com/dutch-oven-how-to-bake-a-carrot-cake/