Roasted Radish and Potato Salad with Black Mustard and Cumin Seed

Name: Roasted Radish and Potato Salad with Black Mustard and Cumin Seed
Ingredients: 1 large Yukon gold potato, cut into bite sized pieces; 8-10 radishes, can be a variety of sizes and types (I had small – large Easter egg radishes and French breakfast radishes), ends trimmed; Extra virgin olive oil; Sea Salt; Freshly ground black pepper; 1/2 teaspoon black mustard seeds; 1/2 teaspoon whole cumin seeds; 2 tablespoons whole milk yogurt; 2 tablespoons thinly sliced green onions; 2 tablespoons lemon juice mixed with ½ t salt and ½ t sugar in a small bowl, until salt and sugar are dissolved