In a large heat-proof bowl, gently whisk egg yolks; set aside.
In a medium-sized heavy saucepan, combine sugar and cornstarch. Gradually whisk in evaporated milk and milk. Bring to a boil over medium-high heat, stirring constantly. Reduce heat to medium-low and cook, whisking gently until thickened, about 2 to 3 minutes. Remove from heat.
Whisk in 1 1/2 cups (375 mL) of the hot mixture into egg yolks. Gradually whisk back into saucepan and bring to a gentle boil, whisking constantly. Reduce heat to low and cook, whisking, for 2 minutes or until thick. Remove from heat and stir in chocolate chips and orange rind until chocolate is melted.
Spoon into small serving dishes and place plastic wrap directly on the surface. Refrigerate until chilled and set, about 3 hours or overnight. Garnish with fresh berries