I used to be the person eating sad desk lunches out of a vending machine or grabbing whatever was fastest and cheapest. And then I wondered why I crashed hard at two in the afternoon every single day. The answer was pretty obvious once I started paying attention. Your lunch is either working for you or against you. There is no middle ground. This mason jar salad is one of my go-to solutions for getting a real, nourishing lunch to work without losing my mind on a Tuesday morning. You can throw these together the night before, toss them in your bag, and eat something that actually fuels you through the afternoon. Wild-caught tuna for serious protein, creamy avocado for healthy fats, a pile of crunchy colorful vegetables, and a bright lemon herb dressing that pulls everything together. No grains, no junk, no guilt. The layering trick is everything. Dressing on the bottom, sturdy veggies next, protein in the middle, delicate greens on top. By the time you get to lunch, nothing is wilted or soggy. Just shake or dump and toss. Done.
Nutritional Benefits
Wild-Caught Tuna
- One of the best portable sources of lean protein you can pack, with around 25 grams per can.
- Rich in omega-3 fatty acids that support brain function and reduce inflammation.
- Wild-caught tuna provides selenium, an important mineral for thyroid health and immune support.
Avocado
- Loaded with monounsaturated fats that keep you full and support cardiovascular health.
- A great source of potassium, which most people are chronically low in.
- The healthy fat in avocado also helps your body absorb fat-soluble vitamins from all those vegetables.
Purple Cabbage
- Packed with anthocyanins, the powerful antioxidants that give it that deep purple color.
- Supports gut health with natural fiber and compounds that feed beneficial bacteria.
- A cruciferous vegetable with real detox-supporting properties through glucosinolates.
Extra Virgin Olive Oil
- One of the most studied, most consistently praised fats in nutrition research.
- Rich in oleocanthal, a natural compound with anti-inflammatory properties similar to ibuprofen.
- Supports healthy cholesterol levels and cardiovascular function.
FAQs
Can I make this mason jar salad the night before?
Absolutely, and that is actually the point. Layer it up the night before, seal it tight, and store it in the fridge. It keeps beautifully for up to 24 hours. Just add the avocado with a little extra lemon juice to keep it from browning, and you are good to go.
What if I do not have a mason jar?
Any airtight container with a wide opening works fine. A glass meal prep container with a lid is a great option. Just keep the dressing separate in a small container on the side if you are worried about sogginess.
Can I swap the tuna for another protein?
Yes. Shredded rotisserie chicken, cooked and cooled shrimp, or even hard-boiled eggs would all be delicious here. Keep the layering the same and you are set.
Is this Whole30 compliant?
It is, as long as your Dijon mustard is Whole30 compliant (check that there is no added sugar or wine). Most basic Dijon brands are fine. Everything else on the ingredient list is clean and compliant.
How do I keep the avocado from turning brown?
Toss the diced avocado in a little extra fresh lemon juice right before layering it into the jar. The acidity slows oxidation. Also, keeping it sealed in the jar with minimal air exposure helps a lot.
If you make this, I want to hear how it went. Drop a comment below or tag me on Instagram. And if you are looking for more real-food paleo lunches you can actually take to work without a ton of prep, check out the rest of the lunch recipes here on the blog. Your two-PM self will thank you.
Ingredients
Instructions
Nutrition Facts
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