For the Vinaigrette, place oil, vinegar, mustard and sea salt in blender container; cover. Blend on high speed until smooth. Pour into small bowl. Stir in Chia Blend. Cover. Refrigerate until ready to use.
For the Tuna, season tuna with sea salt and pepper. Coat with Chia Blend, pressing firmly so mixture adheres to the tuna. Heat oil in large skillet on medium-high heat. Add tuna; sear 1 1/2 to 2 minutes on all sides. Remove tuna to plate; set aside to cool slightly. Cover and refrigerate until ready to serve.
For the Salad, cook potatoes in large saucepan of simmering salted water to cover 15 to 20 minutes or until fork tender. Drain and rinse with cold water. Let drain. Meanwhile, cook green beans in large saucepan of simmering salted water to cover 3 to 5 minutes or until tender-crisp. Drain and rinse with cold water. Drain well. Cut potatoes in half or quarter, depending on size. Place in large bowl with green beans. Add 1/4 cup of the Vinaigrette; toss to coat. Season with sea salt to taste. Set aside.
For the Poached Eggs, fill large deep saucepan with 2 inches of water. Add 1 tablespoon vinegar. Bring to boil. Reduce heat to medium. Break 1 egg into small dish. Carefully slide egg into simmering water (bubbles should begin to break the surface of the water). Repeat with remaining eggs. Poach eggs 3 to 5 minutes or until whites are completely set and yolks begin to thicken. Carefully remove eggs with slotted spoon. Drain on paper towels.
To serve, slice tuna into thin slices. Divide potato mixture, tomatoes, cucumbers and olives among 6 plates. Top each with tuna slices and a poached egg. Drizzle remaining Vinaigrette over tuna slices. Sprinkle egg with additional Chia Blend.