If broccoli seems too firm, blanch florets for 1 minute in boiling water then transfer to a bowl of ice water to cool and stop cooking.
If tahini isn’t on hand, use ½ cup mayonnaise, Greek yogurt, or plain yogurt for a tangier or deli-style dressing.
When salad needs more melding, chill in fridge for at least 1 hour to let dressing coat pasta and vegetables evenly.
If making salad ahead, toss pasta, vegetables, beans, and cheddar with half the dressing, cover and chill up to 24 hours, then mix in remaining dressing before serving.
If storing leftovers, keep salad covered in fridge for 3 to 4 days, then toss before serving because dressing thickens as it chills.