For the tangerine oil cake, beat egg whites with 1/2 tsp stevia granules until stiff peaks form. Beat yolks with 2 tbsp. Stevia granules and grated lemon zest until thick and fluffy.
Strain tangerines, collect juice, mix well with canola oil and rum flavoring and add to yolks. Beat with mixer on high speed for about 5 minutes. Sift flour with baking powder and gently mix in with beaten egg whites and tangerines.
Pour the batter into a greased and floured loaf pan and bake in a preheated oven at 170 degrees for about 40-45 minutes.