Below are some suggestions along with other ideas that can alter the taste of Seman.  This is some knowledge for the unclear!
Bitter taste:

• coffee
• alcohol
• cigarettes
• marijuana (of course there are other sexual reasons to consider cutting out those drugs)

Sharp taste:

• red meat
• greasy foods
• dairy products
• chocolate
• asparagus
• broccoli
• spinach
• garlic
• onions

Sweet taste:

• fruits (pineapple, mango, grapes, apple)
• parsley
• celery
• spearmint
• peppermint
• naturally fermented drinks
• cinnamon
• lemon
• cardamom
• wheatgrass

Several sources suggest that vegetarians may have milder tasting semen, and that people who have diabetes will have sweeter tasting semen. Of course your overall health is of much greater importance to sexual health than the taste of your semen, so any changes in diet need to be done thoughtfully and with your own health in mind. So don’t start downing sugar drinks and candy just to improve the taste of your semen. Improving your overall nutrition will have a greater impact on your sex life than sweetening up the taste of your ejaculate.

Other Methods

Aside from changing your diet there are a few ways to deal with the taste of semen.

• There are many flavored lubricants on the market that may mask the taste (although the taste of most of those products may not be any better than the natural alternative).
• Using a condom during oral sex (flavored or unflavored) is a guaranteed way to keep semen well away from taste buds. It’s also a great way to make oral sex a bit safer.
• Finally there are products currently available that come in pill or powder form that claim to change the taste of semen. Unless a product can produce clinical testing that was published in a reputable and preferably peer-reviewed journal, I wouldn’t recommend spending the money. Many of these products are scams that prey on embarrassment and sexual ignorance of consumers.