Carrots and onion prepped. (I went the fancy route and cut each slice into shapes with a cutter.)
To your slow cooker, add the onion, water, honey, garlic, salt, marjoram, and white pepper. Stir together.
Add the carrots and cubed butter. Stir to combine. Cover and set to Low setting and allow to cook for 3 hours. (I cubed the butter first, by the time I added it, it was very soft, no problem however.)
Check the carrots for tenderness at 3 hours and if tender or very near tender, stir in the drained peas.
Cover and cook for 30 minutes more. If the carrots are not tender, allow to cook for another hour, then add the peas.
Serve as a side dish with any meal.