Orange and Yogurt Cake, a recipe from Gourmetpedia, for food lovers

Ingredients

• - 1 small unsprayed orange
• - 3 eggs
• - 175 g (7/8 cup) fine sugar
• - 100 ml (6 Tbsp.) peanut or canola oil
• - 1 small plain unstirred yogurt, 40%
• - 200 g (2 cups) flour + some for the pan
• - 1 packet baking powder
• - a little butter for the pan