
Raspberry purée is the smooth pulp of raspberries (Rubus idaeus), blended and usually sieved to remove the seeds.
Fruit, acidity and body in one measure, and body is the half a juice cannot give. Seeds are the other question: unstrained purée puts them in the glass, and straining is the difference between a smooth sour and a gritty one.
Raspberry coulis
A coulis is strained and sweetened with sugar, often thinned as well. At the same measure the drink comes out sweeter and looser: drop the syrup from the build, and get the body back by shortening the dilution.
Raspberry juice
Juice is only the pressed liquid, without the fibrous pulp, while purée keeps the flesh of the berry and with it a density and viscosity juice has not got. A drink rebuilt on juice comes out thinner and paler.
Fresh purée is perishable; refrigerate and use within a few days, or freeze.