1. Spinach - Though the recipe calls for frozen, we used fresh. To use fresh, use about 500g/1 lb sliced spinach leaves or baby spinach leaves, saute with a little oil to wilt down and remove excess liquid (important!). Cool then proceed with recipe.
2. Ricotta - We used fresh ricotta from the farmers' market, and it was terrific! Use whole milk ricotta. Low fat ricotta is harder and drier, so it's more difficult to pipe into the tubes plus once baked, is not as juicy and moist. Avoid Perfect Italian brand in tubs. My favourite is Paesanella.
3. For FREEZING or refrigerating uncooked: Add extra 3/4 cup water* into Sauce, cook Sauce per recipe then blend* until smooth. Place filled, uncooked cannelloni in single or multiple dishes, cover with sauce (will look like LOTS!) then cheese. Cover, cool then freeze / refrigerate.
On the day of, thaw then bake per recipe (covered then uncovered). OR bake from frozen, bake covered 35 minutes then uncovered 10 minutes.