Ingredients

• 1 cup / 240 ml freshly squeezed grapefruit juice, strained
• 5 tablespoons unsalted butter, room temperature, soft
• 1/2 cup / 3.5 oz / 100 g granulated sugar OR 1/4 cup / 60 ml honey
• 2 large egg yolks, preferably room temperature
• 2 large eggs, preferably room temperature
• 1/8 teaspoon fine grain sea salt
• 1 tablespoon freshly squeezed lemon juice, strained
• 1 tablespoon fresh ginger juice (made by pressing grated ginger through a strainer)

Directions

1. Simmer the grapefruit juice in a small saucepan, reducing to 1/2 cup / 120 ml. Let it cool a bit.
2. Cream the butter in a medium stainless steel bowl (note: you'll use this bowl as a makeshift double-boiler later). Add the sugar and beat until fluffy and light. Add the yolks, and then the eggs one at a time, beating well to incorporate after each addition. Stir in the salt, and then gradually add the grapefruit juice, lemon juice, and ginger juice - working the juice in as you go.
3. Rinse out the small saucepan you used earlier, and fill 1/3 of the way full with water. Bring to a simmer, and place your stainless steel bowl of curd on top of it. Stir constantly, and heat the curd slowly enough that the sugar (if you used it) has time to dissolve. This step usually takes me about ten minutes. Pull the curd from the heat when it is just thick enough to coat your spoon - my thermometer usually reads ~166°F (it will continue to climb a bit off heat, keep that in mind). Your curd will thick substantially as it cools.
4. There's no need to strain it, unless you somehow ended up with a few lumps (which you shouldn't). And it keeps refrigerated for a week, or up to a month in the freezer. I love it warm or cold.a