OK, I'll take my helmet off so that my fingers can type.Seville Orange is exactly that - bitter orange. Do a google for effects of Saville oranges.
I think you might have mis-read the quote - '' might increase blood pressure in healthy people''
I DID read it correctly but we still don't care, it isn't as if we eat lots of marmalade, not even every day.
We eat porridge most of the 6 cooler months and then when we eat toast for brekker we spread all sorts of stuff over it as W makes all sorts of preserves, marmalade being just one of many.
I think our healthy blood pressure is more at risk from all the booze we drink than anything else. But at our age we really do not care!
We are, of course, aware that bitter oranges are Seville oranges, all the others as far as I know are sweet. But bitter orange is also an ingrdient in things like a variety of Angostura bitters,
So to placate you I checked
Obvs a bit partisan but still, the other sites backed it up.
"Nutritional Value
Seville oranges are a good source of vitamin C, dietary fiber, and thiamine. They also contain potassium, phosphorus, vitamin A, calcium, and some antioxidant and anti-inflammatory properties."
So, the bad effects of eating marmalade and seem to be none, in fact quite the opposite, it is in fact good at reducing cholesterol, fighting infections, relieving constipation, maintaining Vitamin A and C levels, etc etc. The level of sodium in it is very small so not to worry about. Obviously it is high in sugar but then so are all preserves.
They can also be used for an awful lot more than marmalade. "The juice and rind are used for both sweet and savory applications, and the juice can be mixed into syrups, cocktails, vinaigrettes, aioli, sauces, marinades, or as a finishing touch on fish and white meats. The zest can be used to flavor sugars, salts, stews, cooked vegetables, and baked goods such as muffins, cakes, and bread. Seville oranges can also be used as a substitute for key limes or lemons in custards, tarts, or pies. The bitter rind and seeds are ideal for making candied orange peel and traditional marmalade, jams, and jellies as the seeds are high in pectin and naturally thicken the preserves. Seville oranges pair well with meats such as chicken, duck, pork, beef, veal, and white fish, garlic, onion, bay leaves, cilantro, oregano, thyme, cumin, serrano peppers, strawberries, broccoli, gin, whiskey, chocolate, and lemon juice."
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