Preheat oven to 375ºF. Grease 12 muffin cups or line with muffin liners.
Combine the flour, coconut sugar, salt, baking powder, and cardamom. Whisk to incorporate all of the dry ingredients.
1½ cup (6 oz.) all-purpose flour, ⅔ cup coconut sugar, ½ teaspoon salt, 2 teaspoons baking powder, ¼ teaspoon cardamom
Add in milk of choice, applesauce, coconut oil, and vanilla extract, and stir until just moistened. Fold in the rhubarb.
⅓ cup coconut oil, ⅓ cup unsweetened applesauce, ⅓ cup non-dairy milk, 1 teaspoon vanilla extract, ¾ cup chopped rhubarb
Divide the batter between the 12 muffin cups. They should be about ¾ full. Using a large cookie scoop can help evenly divide the batter. Sprinkle the sliced almonds on top of each of the muffins.
¼ cup sliced almonds
Bake for 17 to 20 minutes in the preheated oven, or until a toothpick comes out clean when inserted into the center of the muffin, and the muffins spring back when poked gently with your finger. Cool completely.
They're most delicious when eaten the same day as baking, but they will keep covered at room temperature for a few days. See Notes for storage tips.