Potato salad is a versatile dish enjoyed worldwide, and this classic version featuring tuna, hard-boiled eggs, olives, and a tangy lemon-mustard vinaigrette adds a delicious twist that combines protein, healthy fats, and vibrant flavors. Potatoes provide a hearty base rich in complex carbohydrates and potassium, while canned tuna delivers lean protein and omega-3 fatty acids, supporting heart and brain health. Hard-boiled eggs add texture and boost the protein content, making this salad a balanced meal option. The vinaigrette enhances the salad with its bright acidity and subtle sweetness. Lemon juice offers natural vitamin C and a refreshing tang, while Dijon mustard contributes a mild heat and depth of flavor. The addition of sugar balances the acidity, and black pepper along with optional cayenne pepper can be adjusted to taste for varying spice levels. Green or black olives add a briny contrast, enriching the salad's taste profile. For a lighter dressing alternative, substituting mayonnaise with Greek yogurt not only reduces calories and fat but also adds probiotics beneficial for digestive health. This substitution enhances the salad's creaminess while maintaining a fresh and tangy flavor. When preparing the potatoes, boiling until tender but firm prevents them from becoming mushy when mixed. Chilling the salad for at least two hours allows the ingredients to meld, improving the overall flavor and texture. This salad serves as a great dish for picnics, family gatherings, or a quick lunch. It can be paired with leafy greens or crusty bread to create a satisfying meal. Additionally, customizing with fresh herbs such as parsley or dill enhances aroma and presentation. In summary, this Tuna Potato Salad with hard-boiled eggs, olives, and lemon mustard vinaigrette is a nutritious, flavorful dish suitable for various occasions. Its adaptability through ingredient modifications offers health-conscious and flavor-centric options for every preference.