I think mayonnaise is so easy and cheap to make at home I don't know why people buy it in a store. Here's my recipe:

• 1.5 tsp (7.5 ml) paprika
• 0.5 tsp (2.5 ml) powdered chile
• 1 tsp (5 ml) lime juice
• 4 tsp (20 ml) water
• 4 tsp (20 ml) malt vinegar
• 1.5 tsp (7.5 ml) dry mustard
• 2 egg yolks

Mix this all together to combine, then drizzle in a little less than 2 cups of vegetable oil (480 ml) while mixing vigorously. It will take some practice to get the timing right, but once it starts sounding like you're mixing mac and cheese you can add the oil more quickly. If it doesn't break it should start thickening and getting creamy.

I usually make mine in the food processor.