Thick, garlicky tzatziki with a plate of crunchy vegetables. The step that matters is squeezing the grated cucumber dry, or the dip turns watery within the hour. Fifteen minutes, no cooking.

A serving has about 15g of protein for 176 calories, almost all of it from the yogurt. Strained Greek yogurt has roughly twice the protein of ordinary plain yogurt, which is why this works as a filling snack rather than just a dip.
The vegetables do more than carry the dip. The carrot, pepper and celery sticks add about 4g of fibre a serving, and the red pepper alone provides roughly 95mg of vitamin C, more than the daily amount recommended in both the UK (40mg) and the US (75 to 90mg). Carrots and celery add crunch for very few calories.
Why it is tagged for blood sugar. With 16g of carbohydrate, most of it from the vegetables, plus protein and a little olive oil, this is a snack that is unlikely to cause a sharp rise in blood sugar. It is a better choice than crisps (chips) or crackers with a dip if you are trying to keep snacks steady.
Raw garlic gives tzatziki its bite; its flavour gets stronger as the tzatziki sits, so use one clove if you prefer it milder or are making it a day ahead. For a dairy-free version, use a thick unsweetened soy or coconut yogurt; the protein will be lower with coconut.
Tzatziki is also the sauce in the lamb kofta with bulgur salad. For another vegetable dip, try the beetroot and walnut hummus.