1. Place the spinach, haricots verts, avocado, and peach in a large bowl or on a large platter.
2. Combine the sugar, honey, vegetable oil, vinegar, mustard, garlic, sunflower seeds, and sesame seeds in a jar with a tight-fitting lid. Shake to thoroughly combine.
3. Drizzle the dressing over the salad and toss to coat all over.