Line a sieve with cheesecloth or paper towels and suspend it over a bowl. Pour the yogurt into the sieve and place in refrigerator to drain for 3 hours or overnight.

Place the refrigerated, thickened yogurt into a medium bowl and add the raisins, walnuts, vanilla, honey and orange zest to taste. Thin with orange juice until it is a desirable consistency. Garnish with sections of orange, extra orange zest, raisins or walnuts and serve.