Lightly toast the pumpkin seeds in a cast iron skillet over medium heat, watching closely and stirring often, until golden brown. Careful not to burn. Remove from heat and set aside to cool.Chop lettuce in place in a large salad bowl.Top with radishes, avocado, feta and cooled pumpkin seeds.Put all the dressing ingredients in a high powered blender and blend until smooth.Toss salad with desired amount of dressing and serve immediately.