Materials and tools
1) Orange, grapefruit, lemon, tangerine
3) Any kind of oil, vegetables, olives, canola, etc.
Remove / eat the middle part of the orange, taking care to leave the middle part of the stem intact. Fill the cavity with any type of oil, such as vegetable or olive oil, just below the center stem like a wick. Illuminate the middle stem like a wick. The orange candle lasts to burn for several hours.