Here's a way to start a big meal on a lovely, light note.
The dip is kind of like an Italian green sauce with mayo mixed in;a little pungent, a little spunky; but I've often made a milder version using lemon juice, lemon zest, and dill instead of the vinegar and parsley, or I've added other herbs (marjoram, say, or chives) or lightened it with a bit of sour cream.
All the veggies can be prepped, then wrapped with their own kind in paper towels or clean dishtowels and stored all together in a big Ziploc in the fridge until you're ready to arrange them on a platter.
Green beans: Snap off the stem ends, then drop them in a large pot of boiling water (steam them if you prefer), scoop them out after a few minutes, when they're just tender and bright green, and rinse them well in cold water before wrapping them up in a dishtowel to dry. Leave the water boiling for the broccoli.
Broccoli: Cut off the big stem, peel it, and slice it into narrow sticks. Cut the rest into elegant florets. Blanch it all in the boiling bean water for 2-3 minutes until just crisp-tender and bright green, then drain, chill, and wrap as for the beans.
Fennel: Trim off the feathery top, any depressed-looking outer leaves, and the very bottom, then cut the bulb into vertical slices and cut each of these in half. The core will keep the slices largely intact. Toss them with a bit of olive oil and salt, then roast these on a foil-lined baking sheet at 450 for around 10 minutes until they're browning and tender.
Do the Brussels sprouts the same way: trim them, cut them in half, toss with oil and salt, and roast alongside the fennel, on the same sheet even (cauliflower is also excellent this way too).
Celery is simply cut into sticks; radishes are washed and trimmed; cukes are cut into wedges or slices; endive is separated into leaves that will be eaten only by me.
For the sauce: In a food processor, whir together the parsley leaves, vinegar, olive oil, garlic, salt, capers, fish sauce, black pepper, and ¼ cup of the mayo. Stop the motor to scrape down the sides every now and then, and when it's quite finely ground together, add the rest of the mayo and process until smooth and green.
Taste the dip for seasoning. It should be quite tangy and salty. Scrape it into a small bowl, cover and chill until you're ready to eat.