A chef has created an aphrodisiac Valentine's Day culinary treat made from bull testicles.Charlie Bigham is promoting his cock and bull pie as an alternative to traditional romantic food such as asparagus and oysters.The cooking instructions for the pie encourage people to "turn off the phone, light those candles, slip into something more comfortable".Bull testicles are said to be full of 'sexually stimulating ingredients' and have a long history of being used in Chinese traditional medicine for that purpose.The pie, which also contains ginseng and Mama Juana liquor, is being sold by Ocado.com.A spokesman said: "Charlie's smoothed the way with this very special aphrodisiac pie that will get you in the mood this Valentine's. So relax and let nature take its course."