Confirming the recipe contents:

4x Plants
4x Fruits
7x Mineral Water
3x Cooking Honey

(I was Skilled 2 in Cooking at that moment.)

Hat bei mir auch mit einer grünen Sonnenblume geklappt.

I always use 1 high-quality (green) grape as well as 1 high-quality (green) sunflower and it works without a problem. Professional 9 here but also done it before i reached professinal

The recipe produce only 1 tea not 2 by default.

Artisan 4 here:
1x Special Plant
1x Special Fruit
3x Cooking Honey
7x Mineral Water

Tried to substitute Honey to use 2 only, has a failchance of 50%, so not worth it imo.

Used:
3x Common flower
3x Common Fruit
3x Cooking Honey
7x Mineral Water

high failchance for Professional 9, not worth

Success with 100/100 attempts with:
1x High Quality Strawberry
1x High Quality Sun Flower
3x Cooking Honey
7x Mineral Water

(Cooking Artisan 9)

100% success rate prof 5
1x high quality fruit
1x high quality plant
3x cooking honey
7x mineral water