Shred turnip and cucumber, squeezing out excess moisture, and mix with greek yogurt, lemon juice, mint and cayenne. Salt & pepper to taste and refrigerate.
Add olive oil to large pan on medium heat, add garlic, cooking for about a minute. Add collard greens, reduce heat to low, tossing occasionally and cooking until tender (10-15 minutes).
While collard greens are cooking, add 1 tablespoon olive oil to a pan on medium-high heat.
Salt & pepper salmon, place in pan, cover with lid, cooking for about 5 minutes per side.
Before removing collard greens, add sherry vinegar, radishes, and salt and pepper to taste, continue cooking for about a minute.
Place collard greens on plate, top with salmon, and place radish raita on the side.