The phrase "a tiny cube of" is correct and usable in written English.
It can be used when describing a small, cube-shaped piece of something, often in culinary contexts or when discussing measurements.
Example: "She added a tiny cube of cheese to the salad for extra flavor."
Alternatives: "a small block of" or "a little square of".
A tiny cube of glistening tofu here, a sliver of sizzling Kobe beef there, and before we know it we are so full we're slipping out of our kneeling positions and furtively unbuttoning our skirts.
Lifting the cover of a lacquer bowl might reveal a clear broth with a tiny cube of silken tofu and shreds of chive and citron, followed by a charcoal brazier bearing a small grilled fish, after which an arrangement of candy-coloured dumplings and local wild vegetables might appear on a dish of rustic stoneware.
A tiny cube made of one-inch-square pieces of masking tape might be a work by Tom Friedman, but it is more interesting as a thumbnail sketch (literally) of a plain yet imposing 8-foot-high stack of 4-by-8-foot sheets of plywood.
Wandering is easy when your luggage collapses into a tiny cube.
Lily-bulb soup, creamless but creamy, unctuous and slightly sweet, is the first eyebrow-raiser, punctuated by a tiny cube-shaped cake of cod and mushroom.
Today's 3-D printers have a resolution of 600 dots per inch, which means that they could pack a billion tiny cubes of different materials into a volume that measures just 1.67 cubic inches.
At dinner, the starters were preceded by an amuse bouche — tiny cubes of venison pâté and bites of piping-hot leeks on French toast.
Butter-poached lobster, removed from the shell and placed atop a mélange of chanterelles, tiny cubes of butternut squash, bacon and leeks, was a top-of-the-line pick.
Then there were short penne, called bomboloni, huddled in a bowl under a light, sweet Bolognese with tiny cubes of beef.
Also good was the Long Island duck: a seared breast and a confit of leg served atop a celery root purée and tiny cubes of roasted apple.
We also enjoyed a plate of garlic prawns with tiny cubes of pineapple, served atop a bed of spinach.
