"slightly spicy" is a valid phrase in written English.
You can use it to describe something that has a mild amount of spice or flavor. For example: "This vegetable soup has a nice, slightly spicy flavor."
This one, slightly spicy, is North African.
"Slightly spicy" actually means plenty hot.
It was slightly spicy, in terms of dissonance.
The tomato sauce was slightly spicy and liberally dotted with pancetta and onions.
You'll end up with something savory, tangy and slightly spicy from the chiles.
This is easy food, slightly spicy, with an unexpected sweetness from caramelized gochujang.
For dessert, try the house topfentarte with rhubarb, a slightly spicy take on traditional Austrian cheesecake.
The dough is supposed to be flaky and crunchy, and the filling juicy and slightly spicy.
Among the best is a broth created from smoked bones, with galangal and Chinese celery: light and fragrant, slightly spicy.
The crunchy, boneless pieces of meat tossed with scallions were delightfully sweet and slightly spicy at the same time.
Braised short ribs were fall-away tender and presented with a slightly spicy condiment of carrot, artichoke, cucumber and onion.
