Wash zucchini and cut in half lengthwise. If you want to roast the zucchini over a grill, leave them whole.
Place zucchini on a baking sheet, brush with olive oil and roast in the oven for about 30 minutes. Depending on the size, sometimes it needs a little longer, sometimes a little shorter. On the grill it needs about 30 - 40 minutes. It is ready when it is soft.
Allow zucchini to cool slightly and shave off burnt skin.
Finely grate the garlic with a grater. Squeeze the lemon.
Mash zucchini with a fork. Stir in garlic, lemon juice and tahini until a chunky, creamy dip is formed.
Season zucchini cream with salt and pepper and garnish as desired for serving.