• Heat the oven to 425F. Put the squash and onions in a large bowl. Add the olive oil, salt, and black pepper, and toss well. Spread, skin down, on a baking sheet, and roast for 40 minutes until the vegetables have taken on some color and are cooked through. Keep an eye on the onions: they may cook faster than the squash, so may need to be removed earlier. Remove from the oven and leave to cool.
• Meanwhile, place the tahini in a small bowl with the lemon juice, water, garlic, and salt. Whisk to the consistency of honey, adding more water or tahini as necessary.
• Pour the olive oil into a small frying pan set on medium-low heat. Add the pine nuts and salt. Cook for two minutes, stirring, until the nuts are golden brown. Set aside in a small bowl.
• To serve, spread the vegetables on a platter and drizzle with tahini sauce. Scatter the pine nuts on top, followed by the za'atar and parsley.

For the hard boiled eggs:

• Bring a large pot of water to a boil (large enough to accommodate all the eggs in a single layer).  As soon as the water boils, gently add the eggs. Set a timer for 9 minutes. Bring back to a boil and then turn down to a simmer. 
• Meanwhile, set up a bowl of ice water large enough to accommodate all the eggs. When the eggs are done, use a slotted spoon to transfer the eggs to the bowl of ice water.  Let the eggs sit until cool, about 10-15 minutes. Drain and refrigerate until ready to use.  

For the egg salad:

• Roughly chop all hardboiled eggs and place into a large mixing bowl.
• In a separate bowl, mix together mayonnaise, dijon and fresh lemon juice until well combined.
• Gently fold the dressing into the eggs, adding in celery, chives, and salt & pepper as you mix. Taste and adjust seasoning as desired.