
Yellow bell pepper is a sweet, non-pungent variety of Capsicum annuum with zero heat on the Scoville scale.
Muddle or juice it to order: its aroma fades within the hour, and pressed juice slowly browns. It adds a pale gold color and a soft vegetal sweetness. Tequila and cucumber suit it.
Red or orange bell pepper
Swap them in at the same amount. The sweetness matches, altering mostly just the color.
Green bell pepper
A much less sweet and grassier choice, as it is completely unripe.
Nothing
If the ingredient list marks it optional, just leave it out.
Chili pepper
Avoid this. Only drop a slice in if you actively want real heat, which bell peppers lack entirely.
A whole pepper keeps a week or more in the fridge and softens from the stem end. Cut, it goes limp within a day or two. Pressed juice will not keep to the next service, so it is made to order.