Start by prepping romaine, fruit and pecans. Chop up romaine lettuce and place on a large serving bowl. Slice strawberries, peel and split mandarins into segments, chop pineapple into chunks. Toast pecans if desired by simply putting them in a small pan over the stove on medium-high heat. Give them a toss to make sure they toast evenly for about 1-2 minutes Layer each fruit and pecans over romaine lettuce and set aside.
While grill preheats, in a small jar or bowl mix all of the ingredients for salad dressing; Greek yogurt, olive oil, lemon juice, apple cider vinegar, honey, pink sea salt, and poppy seeds. Whisk until the dressing is well combined. Set aside.
Place marinated chicken on preheated grill. Grill each slice of chicken breast for 7 minutes. Use tongs to flip chicken over and grill for another 7 minutes on the other side. Place chicken on a cutting board and cut into bite size slices.
Give salad a quick toss. Place sliced chicken over tossed salad. Drizzle dressing over salad and give it another toss. Serve immediately. Enjoy!