How to make Red Onion Relish | Rosie Makes Jam Recipes

Red Onion Relish

Delicious with all kinds of cold meats, cheese, barbeques this relish is easy to make and loved by all


Onions, Red,
peeled and finely sliced
34 oz
1 kg
Garlic Clove,
finely chopped
6 each
Olive Oil
8 tbsp
Coriander Seeds,
4 tsp
5 fl oz
150 ml
Muscavado Sugar
8 oz
250 g
Black Pepper,
freshly ground

Rosie's Ingredient Calculator

Onions, Red
Mustard Seed, Black

Enter the quantity of one or more of the ingredients that you have and Rosie will adjust the quantities to match.


  1. Wash and drain your jars and then place upside down in a warm oven 50C/Gas Mark 1 to dry and warm
  2. Finely slice the onions and place in a large pan
  3. Crush the cloves of garlic and add
  4. Add the olive oil, mustard seeds and coriander seeds stirring well to combine
  5. Cook gently over a low heat for 20 minutes stirring occasionally
  6. Stir in the vinegar with the sugar and continue cooking for another 10-20 minutes until the onions are translucent and reduced
  7. Season to taste
  8. Pot into the warm jars ensuring that you pay attention to air-pockets - use a dinner knife or chopstick to move the contents so the air can be released
  9. Delicious with good sausages, burgers or stirred into gravy for a roast or mayonnaise for a salad

How long will it take to make?

Preparation time:
10 mins
Cooking time:
50 mins
Total time:
60 mins

How much?

approx. 6 x 190ml/8oz jars

Look after it

At its best if used within 2 months, and 2 weeks refrigerated once opened

This information is based on the standard recipe quantities and has not be updated by Rosie's Ingredient calculator

Useful links

Rosie's Preserving School Workshops

Rosie's Preserving School Workhop Recipe - Red Onion Relish

Red Onion Relish