Peel the orange and divide it into segments. Line a large plate with wax paper.
Place the chocolate in a small microwave-safe bowl and melt it in the microwave in two or three 30-second sessions, stirring after each session. Stir the oil and sweetener into the melted chocolate.
Dip half of each orange section into the melted chocolate. Swirl to allow any excess chocolate to drip back into the bowl.
Place the dipped orange segments on the prepared plate. Refrigerate them until set, for about 20 minutes, then serve.
I add stevia because I use very dark chocolate. Depending on the chocolate you use, you may or may not need to add a sweetener.
Melting chocolate in the microwave is quick and easy. You can also use a saucepan, but using the microwave is easier. Just make sure you do it in 2-3 sessions and stir after each session to avoid burning the chocolate.
You can keep the leftovers in an airtight container in the fridge for 3-4 days. Remove them from the fridge about an hour before serving. Chocolate and fruit are always best at room temperature. I don't recommend freezing the leftovers.