In a clean jar, mix the ingredients and shake to emulsify.
Taste and adjust if necessary. The goal is a clean simple dressing that excites without puckering.
Notes on dressing: Any good quality nut oil will work in this recipe (avocado? walnut? almond? these would be delicious). Any good quality wine vinegar will work too. Balsamic might be too sweet in this dressing.
Cut muscat grapes in half and put in salad bowl.
Wash and strip purslane leaves from thick stems (thinner stems are fine). Ratio is about 2-3 parts purslane to 1 part grapes.