Hello! Keeping a salad fresh for a quick weeknight dinner comes down to layering ingredients correctly and keeping moisture away from the greens until the very last minute.
First, always store your wet ingredients like tomatoes and cucumbers separately from the leafy greens. Second, use airtight containers lined with a paper towel to absorb excess moisture. Finally, never add your dressing until you are ready to serve, as salt causes the lettuce to wilt and get soggy quickly.